SAML authentication Error: HTTP Status 500 – Internal Server Error

Must-share information (formatted with Markdown):

  • which versions are you using (SonarQube Server / Community Build, Scanner, Plugin, and any relevant extension)
    → SonarQube Developer Edition v2025.1.3 (110580)
  • how is SonarQube deployed: Helm through azure pipelines
  • what are you trying to achieve
    → We are using previously sonar-auth-aad-plugin-1.3.2.jar plugin for login to Server. But this plugin was giving error when we upgrade sonarqube version from 9.9 → 10.x → v2025.1.3 (110580). So we have changed it to SAML authentication and Created new enterprise app registration in our AD.
    We have configured the setting in sonarqube server from UI and when we click Test configuration it gives 500 error.

  • what have you tried so far to achieve this
    Tried reconfiguration by removing and reregistration of Enterprise app in AD but no luck.
    Below are attached Debug logs for your reference. Please help us as we are stuck from last 2-3 months with this issue.
2025.07.25 12:07:09 ERROR web[][o.s.s.p.w.RootFilter] Processing of request /saml/validation?CSRFToken=3lib1at47kgna3mngfculo8pod failed
java.lang.IllegalArgumentException: Input byte array has incorrect ending byte at 1000
	at java.base/java.util.Base64$Decoder.decode0(Unknown Source)
	at java.base/java.util.Base64$Decoder.decode(Unknown Source)
	at java.base/java.util.Base64$Decoder.decode(Unknown Source)
	at org.sonar.auth.saml.SamlCertificateConverter.toX509Certificate(SamlCertificateConverter.java:37)
	at org.sonar.auth.saml.SonarqubeRelyingPartyRegistrationRepository.findByRegistrationId(SonarqubeRelyingPartyRegistrationRepository.java:57)
	at org.springframework.security.saml2.provider.service.web.DefaultRelyingPartyRegistrationResolver.resolve(DefaultRelyingPartyRegistrationResolver.java:83)
	at org.sonar.auth.saml.SonarqubeRelyingPartyRegistrationResolver.resolve(SonarqubeRelyingPartyRegistrationResolver.java:45)
	at org.springframework.security.saml2.provider.service.web.Saml2AuthenticationTokenConverter.convert(Saml2AuthenticationTokenConverter.java:65)
	at org.sonar.auth.saml.SamlResponseAuthenticator.processSamlResponse(SamlResponseAuthenticator.java:54)
	at org.sonar.auth.saml.SamlResponseAuthenticator.authenticate(SamlResponseAuthenticator.java:45)
	at org.sonar.auth.saml.SamlAuthenticator.getAuthenticationStatusPage(SamlAuthenticator.java:77)
	at org.sonar.server.saml.ws.ValidationAction.doFilter(ValidationAction.java:96)
	at org.sonar.server.platform.web.MasterServletFilter$JavaxFilterAdapter.doFilter(MasterServletFilter.java:194)
	at org.sonar.server.platform.web.MasterServletFilter$GodFilterChain.doFilter(MasterServletFilter.java:165)
	at org.sonar.server.platform.web.MasterServletFilter$HttpFilterChainAdapter.doFilter(MasterServletFilter.java:208)
	at org.sonar.server.authentication.ResetPasswordFilter.doFilter(ResetPasswordFilter.java:67)
	at org.sonar.server.platform.web.MasterServletFilter$JavaxFilterAdapter.doFilter(MasterServletFilter.java:194)
	at org.sonar.server.platform.web.MasterServletFilter$GodFilterChain.doFilter(MasterServletFilter.java:165)
	at org.sonar.server.platform.web.MasterServletFilter$HttpFilterChainAdapter.doFilter(MasterServletFilter.java:208)
	at org.sonar.server.authentication.DefaultAdminCredentialsVerifierFilter.doFilter(DefaultAdminCredentialsVerifierFilter.java:83)
	at org.sonar.server.platform.web.MasterServletFilter$JavaxFilterAdapter.doFilter(MasterServletFilter.java:194)
	at org.sonar.server.platform.web.MasterServletFilter$GodFilterChain.doFilter(MasterServletFilter.java:165)
	at org.sonar.server.platform.web.MasterServletFilter.doFilter(MasterServletFilter.java:126)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
	at org.sonar.server.platform.web.UserSessionFilter.doFilter(UserSessionFilter.java:83)
	at org.sonar.server.platform.web.UserSessionFilter.doFilter(UserSessionFilter.java:70)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
	at org.sonar.server.platform.web.CspFilter.doFilter(CspFilter.java:67)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
	at org.sonar.server.platform.web.CacheControlFilter.doFilter(CacheControlFilter.java:76)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
	at org.sonar.server.platform.web.SecurityServletFilter.doHttpFilter(SecurityServletFilter.java:60)
	at org.sonar.server.platform.web.SecurityServletFilter.doFilter(SecurityServletFilter.java:47)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
	at org.sonar.server.platform.web.RedirectFilter.doFilter(RedirectFilter.java:56)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
	at org.sonar.server.platform.web.EndpointPathFilter.doFilter(EndpointPathFilter.java:47)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
	at org.sonar.server.platform.web.RequestIdFilter.doFilter(RequestIdFilter.java:66)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
	at org.sonar.server.platform.web.RootFilter.doFilter(RootFilter.java:65)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
	at org.apache.catalina.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:115)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:483)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:116)
	at ch.qos.logback.access.tomcat.LogbackValve.invoke(LogbackValve.java:268)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:398)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:903)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1769)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1189)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:658)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63)
	at java.base/java.lang.Thread.run(Unknown Source)

previous post: SonarQube failed to login with aad-auth plugin 2.0.0 - #7 by abhilash_pimpalnerka

Thanks,
Abhilash

Hey there.

This error says to me something is wrong with the Identity provider (SAML) certificate certificate you’ve provided in your SonarQube Config. It should look something like this:

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

That’s the base 64 certificate you’re meant to downoad in this step.

Can you confirm you’re downloading the certificate as instructed and pasting it exactly in SonarQube?

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