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<!doctype html><html lang=en><head><title>Setting Up Jellyfin SSO with Authentik: Surviving the Beta · Eric X. Liu's Personal Page</title><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=color-scheme content="light dark"><meta http-equiv=Content-Security-Policy content="upgrade-insecure-requests; block-all-mixed-content; default-src 'self'; child-src 'self'; font-src 'self' https://fonts.gstatic.com https://cdn.jsdelivr.net/; form-action 'self'; frame-src 'self' https://www.youtube.com https://disqus.com; img-src 'self' https://referrer.disqus.com https://c.disquscdn.com https://*.disqus.com; object-src 'none'; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com/ https://cdn.jsdelivr.net/; script-src 'self' 'unsafe-inline' https://www.google-analytics.com https://cdn.jsdelivr.net/ https://pagead2.googlesyndication.com https://static.cloudflareinsights.com https://unpkg.com https://ericxliu-me.disqus.com https://disqus.com https://*.disqus.com https://*.disquscdn.com https://unpkg.com; connect-src 'self' https://www.google-analytics.com https://pagead2.googlesyndication.com https://cloudflareinsights.com ws://localhost:1313 ws://localhost:* wss://localhost:* https://links.services.disqus.com https://*.disqus.com;"><meta name=author content="Eric X. Liu"><meta name=description content="I recently integrated Jellyfin with Authentik for Single Sign-On (SSO). While the plugin works, it is still very much in an early development phase. The logging is often sparse or cryptic, and the feedback loop can be frustrating. Here is a guide focused on the obscure errors you might encounter and the simple fixes that aren’t immediately obvious.
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The Setup
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Link to heading
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The configuration is best handled via API (curl) rather than the UI, as it ensures all fields are correctly typed and persistent."><meta name=keywords content="software engineer,performance engineering,Google engineer,tech blog,software development,performance optimization,Eric Liu,engineering blog,mountain biking,Jeep enthusiast,overlanding,camping,outdoor adventures"><meta name=twitter:card content="summary"><meta name=twitter:title content="Setting Up Jellyfin SSO with Authentik: Surviving the Beta"><meta name=twitter:description content="I recently integrated Jellyfin with Authentik for Single Sign-On (SSO). While the plugin works, it is still very much in an early development phase. The logging is often sparse or cryptic, and the feedback loop can be frustrating. Here is a guide focused on the obscure errors you might encounter and the simple fixes that aren’t immediately obvious.
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The Setup Link to heading The configuration is best handled via API (curl) rather than the UI, as it ensures all fields are correctly typed and persistent."><meta property="og:url" content="https://ericxliu.me/posts/jellyfin-sso-with-authentik/"><meta property="og:site_name" content="Eric X. Liu's Personal Page"><meta property="og:title" content="Setting Up Jellyfin SSO with Authentik: Surviving the Beta"><meta property="og:description" content="I recently integrated Jellyfin with Authentik for Single Sign-On (SSO). While the plugin works, it is still very much in an early development phase. The logging is often sparse or cryptic, and the feedback loop can be frustrating. Here is a guide focused on the obscure errors you might encounter and the simple fixes that aren’t immediately obvious.
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The Setup Link to heading The configuration is best handled via API (curl) rather than the UI, as it ensures all fields are correctly typed and persistent."><meta property="og:locale" content="en"><meta property="og:type" content="article"><meta property="article:section" content="posts"><meta property="article:published_time" content="2025-12-28T00:00:00+00:00"><meta property="article:modified_time" content="2025-12-28T20:42:03+00:00"><link rel=preload href=/fonts/fa-solid-900.woff2 as=font type=font/woff2 crossorigin><link rel=preload href=/fonts/fa-brands-400.woff2 as=font type=font/woff2 crossorigin><link rel=canonical href=https://ericxliu.me/posts/jellyfin-sso-with-authentik/><link rel=preload href=/fonts/fa-brands-400.woff2 as=font type=font/woff2 crossorigin><link rel=preload href=/fonts/fa-regular-400.woff2 as=font type=font/woff2 crossorigin><link rel=preload href=/fonts/fa-solid-900.woff2 as=font type=font/woff2 crossorigin><link rel=stylesheet href=/css/coder.min.4b392a85107b91dbdabc528edf014a6ab1a30cd44cafcd5325c8efe796794fca.css integrity="sha256-SzkqhRB7kdvavFKO3wFKarGjDNRMr81TJcjv55Z5T8o=" crossorigin=anonymous media=screen><link rel=stylesheet href=/css/coder-dark.min.a00e6364bacbc8266ad1cc81230774a1397198f8cfb7bcba29b7d6fcb54ce57f.css integrity="sha256-oA5jZLrLyCZq0cyBIwd0oTlxmPjPt7y6KbfW/LVM5X8=" crossorigin=anonymous media=screen><link rel=icon type=image/svg+xml href=/images/favicon.svg sizes=any><link rel=icon type=image/png href=/images/favicon-32x32.png sizes=32x32><link rel=icon type=image/png href=/images/favicon-16x16.png sizes=16x16><link rel=apple-touch-icon href=/images/apple-touch-icon.png><link rel=apple-touch-icon sizes=180x180 href=/images/apple-touch-icon.png><link rel=manifest href=/site.webmanifest><link rel=mask-icon href=/images/safari-pinned-tab.svg color=#5bbad5><script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-3972604619956476" crossorigin=anonymous></script><script type=application/ld+json>{"@context":"http://schema.org","@type":"Person","name":"Eric X. Liu","url":"https:\/\/ericxliu.me\/","description":"Software \u0026 Performance Engineer at Google","sameAs":["https:\/\/www.linkedin.com\/in\/eric-x-liu-46648b93\/","https:\/\/git.ericxliu.me\/eric"]}</script><script type=application/ld+json>{"@context":"http://schema.org","@type":"BlogPosting","headline":"Setting Up Jellyfin SSO with Authentik: Surviving the Beta","genre":"Blog","wordcount":"516","url":"https:\/\/ericxliu.me\/posts\/jellyfin-sso-with-authentik\/","datePublished":"2025-12-28T00:00:00\u002b00:00","dateModified":"2025-12-28T20:42:03\u002b00:00","description":"\u003cp\u003eI recently integrated Jellyfin with Authentik for Single Sign-On (SSO). While the plugin works, it is still very much in an early development phase. The logging is often sparse or cryptic, and the feedback loop can be frustrating. Here is a guide focused on the obscure errors you might encounter and the simple fixes that aren\u0026rsquo;t immediately obvious.\u003c\/p\u003e\n\u003ch2 id=\u0022the-setup\u0022\u003e\n The Setup\n \u003ca class=\u0022heading-link\u0022 href=\u0022#the-setup\u0022\u003e\n \u003ci class=\u0022fa-solid fa-link\u0022 aria-hidden=\u0022true\u0022 title=\u0022Link to heading\u0022\u003e\u003c\/i\u003e\n \u003cspan class=\u0022sr-only\u0022\u003eLink to heading\u003c\/span\u003e\n \u003c\/a\u003e\n\u003c\/h2\u003e\n\u003cp\u003eThe configuration is best handled via API (curl) rather than the UI, as it ensures all fields are correctly typed and persistent.\u003c\/p\u003e","author":{"@type":"Person","name":"Eric X. Liu"}}</script></head><body class="preload-transitions colorscheme-auto"><div class=float-container><a id=dark-mode-toggle class=colorscheme-toggle><i class="fa-solid fa-adjust fa-fw" aria-hidden=true></i></a></div><main class=wrapper><nav class=navigation><section class=container><a class=navigation-title href=https://ericxliu.me/>Eric X. Liu's Personal Page
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<label class="menu-button float-right" for=menu-toggle><i class="fa-solid fa-bars fa-fw" aria-hidden=true></i></label><ul class=navigation-list><li class=navigation-item><a class=navigation-link href=/posts/>Posts</a></li><li class=navigation-item><a class=navigation-link href=https://chat.ericxliu.me>Chat</a></li><li class=navigation-item><a class=navigation-link href=https://git.ericxliu.me/user/oauth2/Authenitk>Git</a></li><li class=navigation-item><a class=navigation-link href=https://coder.ericxliu.me/api/v2/users/oidc/callback>Coder</a></li><li class=navigation-item><a class=navigation-link href=/about/>About</a></li><li class=navigation-item><a class=navigation-link href=/>|</a></li><li class=navigation-item><a class=navigation-link href=https://sso.ericxliu.me>Sign in</a></li></ul></section></nav><div class=content><section class="container post"><article><header><div class=post-title><h1 class=title><a class=title-link href=https://ericxliu.me/posts/jellyfin-sso-with-authentik/>Setting Up Jellyfin SSO with Authentik: Surviving the Beta</a></h1></div><div class=post-meta><div class=date><span class=posted-on><i class="fa-solid fa-calendar" aria-hidden=true></i>
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<time datetime=2025-12-28T00:00:00Z>December 28, 2025
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</time></span><span class=reading-time><i class="fa-solid fa-clock" aria-hidden=true></i>
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3-minute read</span></div></div></header><div class=post-content><p>I recently integrated Jellyfin with Authentik for Single Sign-On (SSO). While the plugin works, it is still very much in an early development phase. The logging is often sparse or cryptic, and the feedback loop can be frustrating. Here is a guide focused on the obscure errors you might encounter and the simple fixes that aren’t immediately obvious.</p><h2 id=the-setup>The Setup
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<a class=heading-link href=#the-setup><i class="fa-solid fa-link" aria-hidden=true title="Link to heading"></i>
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<span class=sr-only>Link to heading</span></a></h2><p>The configuration is best handled via API (curl) rather than the UI, as it ensures all fields are correctly typed and persistent.</p><h3 id=1-authentik-terraform>1. Authentik (Terraform)
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<a class=heading-link href=#1-authentik-terraform><i class="fa-solid fa-link" aria-hidden=true title="Link to heading"></i>
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<span class=sr-only>Link to heading</span></a></h3><p>Let Authentik manage the secrets. Don’t hardcode them.</p><div class=highlight><pre tabindex=0 style=color:#e6edf3;background-color:#0d1117;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-hcl data-lang=hcl><span style=display:flex><span><span style=color:#ff7b72>resource</span> <span style=color:#a5d6ff>"authentik_provider_oauth2" "jellyfin"</span> {
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</span></span><span style=display:flex><span> name <span style=color:#ff7b72;font-weight:700>=</span> <span style=color:#a5d6ff>"Jellyfin"</span>
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</span></span><span style=display:flex><span> client_id <span style=color:#ff7b72;font-weight:700>=</span> <span style=color:#a5d6ff>"jellyfin-ericxliu-me"</span><span style=color:#8b949e;font-style:italic>
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</span></span></span><span style=display:flex><span><span style=color:#8b949e;font-style:italic> # client_secret omitted -> auto-generated
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</span></span></span><span style=display:flex><span> property_mappings <span style=color:#ff7b72;font-weight:700>=</span> [
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</span></span><span style=display:flex><span> <span style=color:#ff7b72>authentik_scope_mapping</span>.<span style=color:#ff7b72>openid</span>.<span style=color:#ff7b72>id</span>,
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</span></span><span style=display:flex><span> <span style=color:#ff7b72>authentik_scope_mapping</span>.<span style=color:#ff7b72>profile</span>.<span style=color:#ff7b72>id</span>,
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</span></span><span style=display:flex><span> <span style=color:#ff7b72>authentik_scope_mapping</span>.<span style=color:#ff7b72>email</span>.<span style=color:#ff7b72>id</span>,
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</span></span><span style=display:flex><span> <span style=color:#ff7b72>authentik_scope_mapping</span>.<span style=color:#ff7b72>groups</span>.<span style=color:#ff7b72>id</span>
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</span></span><span style=display:flex><span> ]<span style=color:#8b949e;font-style:italic>
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</span></span></span><span style=display:flex><span><span style=color:#8b949e;font-style:italic> # ...
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</span></span></span><span style=display:flex><span>}
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</span></span></code></pre></div><h3 id=2-jellyfin-plugin-bashcurl>2. Jellyfin Plugin (Bash/Curl)
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<a class=heading-link href=#2-jellyfin-plugin-bashcurl><i class="fa-solid fa-link" aria-hidden=true title="Link to heading"></i>
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<span class=sr-only>Link to heading</span></a></h3><div class=highlight><pre tabindex=0 style=color:#e6edf3;background-color:#0d1117;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-bash data-lang=bash><span style=display:flex><span><span style=color:#8b949e;font-style:italic># ... (retrieve secret from terraform) ...</span>
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</span></span><span style=display:flex><span>curl -X POST <span style=color:#a5d6ff>"https://jellyfin.ericxliu.me/SSO/OID/Add/authentik"</span> ... -d <span style=color:#a5d6ff>'{
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</span></span></span><span style=display:flex><span><span style=color:#a5d6ff> "OidClientId": "jellyfin-ericxliu-me",
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</span></span></span><span style=display:flex><span><span style=color:#a5d6ff> "OidSecret": "'</span><span style=color:#a5d6ff>"</span><span style=color:#a5d6ff>${</span><span style=color:#79c0ff>SECRET</span><span style=color:#a5d6ff>}</span><span style=color:#a5d6ff>"</span><span style=color:#a5d6ff>'",
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</span></span></span><span style=display:flex><span><span style=color:#a5d6ff> "OidScopes": ["openid", "profile", "email", "groups"],
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</span></span></span><span style=display:flex><span><span style=color:#a5d6ff> "SchemeOverride": "https",
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</span></span></span><span style=display:flex><span><span style=color:#a5d6ff> "RoleClaim": "groups"
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</span></span></span><span style=display:flex><span><span style=color:#a5d6ff> }'</span>
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</span></span></code></pre></div><h2 id=obscure-errors--fixes>Obscure Errors & Fixes
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<a class=heading-link href=#obscure-errors--fixes><i class="fa-solid fa-link" aria-hidden=true title="Link to heading"></i>
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<span class=sr-only>Link to heading</span></a></h2><p>Because the plugin is still maturing, it doesn’t always handle configuration errors gracefully. Here are the two main “cryptic” failures I encountered.</p><h3 id=1-the-value-cannot-be-null-crash>1. The “Value cannot be null” Crash
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<a class=heading-link href=#1-the-value-cannot-be-null-crash><i class="fa-solid fa-link" aria-hidden=true title="Link to heading"></i>
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<span class=sr-only>Link to heading</span></a></h3><p><strong>The Symptom</strong>:
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You attempt to start the SSO flow and get a generic 500 error. The Jellyfin logs show a C# exception:</p><div class=highlight><pre tabindex=0 style=color:#e6edf3;background-color:#0d1117;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-fallback data-lang=fallback><span style=display:flex><span>System.ArgumentNullException: Value cannot be null. (Parameter 'source')
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</span></span><span style=display:flex><span> at System.Linq.Enumerable.Prepend[TSource](IEnumerable`1 source, TSource element)
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</span></span><span style=display:flex><span> at Jellyfin.Plugin.SSO.Api.SSOController.OidChallenge(...)
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</span></span></code></pre></div><p><strong>The Reality</strong>:
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This looks like deep internal failure, but it’s actually a simple configuration miss. The plugin code attempts to prepend “openid profile” to your configured scopes without checking if your scopes array exists first.
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<strong>The Fix</strong>:
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You <strong>must</strong> explicitly provide <code>"OidScopes"</code> in your JSON configuration. It cannot be null or omitted.</p><div class=highlight><pre tabindex=0 style=color:#e6edf3;background-color:#0d1117;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-json data-lang=json><span style=display:flex><span><span style=color:#a5d6ff>"OidScopes"</span><span style=color:#f85149>:</span> [<span style=color:#a5d6ff>"openid"</span>, <span style=color:#a5d6ff>"profile"</span>, <span style=color:#a5d6ff>"email"</span>, <span style=color:#a5d6ff>"groups"</span>]
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</span></span></code></pre></div><h3 id=2-the-httphttps-mismatch-redirect-loop>2. The HTTP/HTTPS Mismatch (Redirect Loop)
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<a class=heading-link href=#2-the-httphttps-mismatch-redirect-loop><i class="fa-solid fa-link" aria-hidden=true title="Link to heading"></i>
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<span class=sr-only>Link to heading</span></a></h3><p><strong>The Symptom</strong>:
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Authentik rejects the authorization request with “Redirect URI mismatch”, or the browser enters a redirect loop.
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<strong>The Reality</strong>:
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Jellyfin often sits behind a reverse proxy (Ingress/Traefik) terminating TLS. Use <code>Browser Developer Tools</code> to inspect the network requests. You will likely see the <code>redirect_uri</code> parameter encoded as <code>http://jellyfin...</code> instead of <code>https://</code>. configuration.
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<strong>The Fix</strong>:
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Do not rely on header forwarding magic. Force the scheme in the plugin configuration:</p><div class=highlight><pre tabindex=0 style=color:#e6edf3;background-color:#0d1117;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-json data-lang=json><span style=display:flex><span><span style=color:#a5d6ff>"SchemeOverride"</span><span style=color:#f85149>:</span> <span style=color:#a5d6ff>"https"</span>
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</span></span></code></pre></div><h3 id=3-case-sensitivity-in-json>3. Case Sensitivity in JSON
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<a class=heading-link href=#3-case-sensitivity-in-json><i class="fa-solid fa-link" aria-hidden=true title="Link to heading"></i>
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<span class=sr-only>Link to heading</span></a></h3><p><strong>The Symptom</strong>: Configuration seems to be ignored or fields remain empty after a POST.
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<strong>The Reality</strong>: The plugin’s API controller keys are Case Sensitive in some versions/contexts.
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<strong>The Fix</strong>: Stick to PascalCase for the keys (<code>OidEndpoint</code>, <code>AdminRoles</code>) as seen in the C# DTOs, rather than camelCase (<code>oidEndpoint</code>), unless the specific version documentation explicitly states otherwise. When in doubt, checking the source code (<code>SSOController.cs</code>) is often faster than trusting the README.</p><h2 id=summary>Summary
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<a class=heading-link href=#summary><i class="fa-solid fa-link" aria-hidden=true title="Link to heading"></i>
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<span class=sr-only>Link to heading</span></a></h2><p>When debugging Jellyfin SSO, don’t trust the UI to tell you what’s wrong.</p><ol><li><strong>Check the logs</strong> (<code>kubectl logs</code>) for C# stack traces.</li><li><strong>Sanitize your JSON</strong> inputs (arrays can’t be null).</li><li><strong>Inspect the URL parameters</strong> in your browser to see what Redirect URI is actually being generated.</li></ol><h3 id=references>References
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<a class=heading-link href=#references><i class="fa-solid fa-link" aria-hidden=true title="Link to heading"></i>
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<span class=sr-only>Link to heading</span></a></h3><ul><li>Jellyfin SSO Plugin Repository: <code>https://github.com/9p4/jellyfin-plugin-sso</code></li><li>Authentik Documentation: <code>https://goauthentik.io/docs/providers/oauth2/</code></li><li>Jellyfin API Documentation: <code>https://api.jellyfin.org/</code></li></ul></div><footer><div id=disqus_thread></div><script>window.disqus_config=function(){},function(){if(["localhost","127.0.0.1"].indexOf(window.location.hostname)!=-1){document.getElementById("disqus_thread").innerHTML="Disqus comments not available by default when the website is previewed locally.";return}var t=document,e=t.createElement("script");e.async=!0,e.src="//ericxliu-me.disqus.com/embed.js",e.setAttribute("data-timestamp",+new Date),(t.head||t.body).appendChild(e)}(),document.addEventListener("themeChanged",function(){document.readyState=="complete"&&DISQUS.reset({reload:!0,config:disqus_config})})</script></footer></article><link rel=stylesheet href=https://cdn.jsdelivr.net/npm/katex@0.16.4/dist/katex.min.css integrity=sha384-vKruj+a13U8yHIkAyGgK1J3ArTLzrFGBbBc0tDp4ad/EyewESeXE/Iv67Aj8gKZ0 crossorigin=anonymous><script defer src=https://cdn.jsdelivr.net/npm/katex@0.16.4/dist/katex.min.js integrity=sha384-PwRUT/YqbnEjkZO0zZxNqcxACrXe+j766U2amXcgMg5457rve2Y7I6ZJSm2A0mS4 crossorigin=anonymous></script><script defer src=https://cdn.jsdelivr.net/npm/katex@0.16.4/dist/contrib/auto-render.min.js integrity=sha384-+VBxd3r6XgURycqtZ117nYw44OOcIax56Z4dCRWbxyPt0Koah1uHoK0o4+/RRE05 crossorigin=anonymous onload='renderMathInElement(document.body,{delimiters:[{left:"$$",right:"$$",display:!0},{left:"$",right:"$",display:!1},{left:"\\(",right:"\\)",display:!1},{left:"\\[",right:"\\]",display:!0}]})'></script></section></div><footer class=footer><section class=container>©
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2016 -
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2025
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Eric X. Liu
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<a href="https://git.ericxliu.me/eric/ericxliu-me/commit/13a094e">[13a094e]</a></section></footer></main><script src=/js/coder.min.6ae284be93d2d19dad1f02b0039508d9aab3180a12a06dcc71b0b0ef7825a317.js integrity="sha256-auKEvpPS0Z2tHwKwA5UI2aqzGAoSoG3McbCw73gloxc="></script><script defer src=https://static.cloudflareinsights.com/beacon.min.js data-cf-beacon='{"token": "987638e636ce4dbb932d038af74c17d1"}'></script></body></html>
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