Getting error while trying to log in

Hi.
I have a very peculiar problem with shinyproxy authentication. The server is on ubuntu 20.04 and I am using nginx to serve the apps. For authentication, I am using OpenID (Auth0).

The problem occurs every now and then when a user tries to log in. After inserting the username and password, instead of going to the desired app, it takes the user to page syaing “An error occurred during the authentication procedure

But after that, going back to the login page and inserting the username and password works fine.

This is what I am getting from the logs:

2022-04-20 18:40:28.580 ERROR 1380035 --- [XNIO-1 task-5] e.o.c.a.i.OpenIDAuthenticationBackend    : org.springframework.security.oauth2.core.OAuth2AuthenticationException: [authorization_request_not_found] 

org.springframework.security.oauth2.core.OAuth2AuthenticationException: [authorization_request_not_found] 
	at org.springframework.security.oauth2.client.web.OAuth2LoginAuthenticationFilter.attemptAuthentication(OAuth2LoginAuthenticationFilter.java:163) ~[spring-security-oauth2-client-5.3.4.RELEASE.jar!/:5.3.4.RELEASE]
	at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:212) ~[spring-security-web-5.3.4.RELEASE.jar!/:5.3.4.RELEASE]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.3.4.RELEASE.jar!/:5.3.4.RELEASE]
	at org.springframework.security.oauth2.client.web.OAuth2AuthorizationRequestRedirectFilter.doFilterInternal(OAuth2AuthorizationRequestRedirectFilter.java:160) [spring-security-oauth2-client-5.3.4.RELEASE.jar!/:5.3.4.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.3.4.RELEASE.jar!/:5.3.4.RELEASE]
	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116) [spring-security-web-5.3.4.RELEASE.jar!/:5.3.4.RELEASE]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.3.4.RELEASE.jar!/:5.3.4.RELEASE]
	at org.springframework.security.web.csrf.CsrfFilter.doFilterInternal(CsrfFilter.java:117) [spring-security-web-5.3.4.RELEASE.jar!/:5.3.4.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.3.4.RELEASE.jar!/:5.3.4.RELEASE]
	at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:92) [spring-security-web-5.3.4.RELEASE.jar!/:5.3.4.RELEASE]
	at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:77) [spring-security-web-5.3.4.RELEASE.jar!/:5.3.4.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.3.4.RELEASE.jar!/:5.3.4.RELEASE]
	at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105) [spring-security-web-5.3.4.RELEASE.jar!/:5.3.4.RELEASE]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.3.4.RELEASE.jar!/:5.3.4.RELEASE]
	at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56) [spring-security-web-5.3.4.RELEASE.jar!/:5.3.4.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.3.4.RELEASE.jar!/:5.3.4.RELEASE]
	at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:215) [spring-security-web-5.3.4.RELEASE.jar!/:5.3.4.RELEASE]
	at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178) [spring-security-web-5.3.4.RELEASE.jar!/:5.3.4.RELEASE]
	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:358) [spring-web-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:271) [spring-web-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) [undertow-servlet-2.1.4.Final.jar!/:2.1.4.Final]
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) [undertow-servlet-2.1.4.Final.jar!/:2.1.4.Final]
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) [spring-web-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) [undertow-servlet-2.1.4.Final.jar!/:2.1.4.Final]
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) [undertow-servlet-2.1.4.Final.jar!/:2.1.4.Final]
	at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:93) [spring-boot-actuator-2.3.4.RELEASE.jar!/:2.3.4.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) [undertow-servlet-2.1.4.Final.jar!/:2.1.4.Final]
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) [undertow-servlet-2.1.4.Final.jar!/:2.1.4.Final]
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) [spring-web-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.9.RELEASE.jar!/:5.2.9.RELEASE]
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) [undertow-servlet-2.1.4.Final.jar!/:2.1.4.Final]
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) [undertow-servlet-2.1.4.Final.jar!/:2.1.4.Final]
	at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84) [undertow-servlet-2.1.4.Final.jar!/:2.1.4.Final]
	at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62) [undertow-servlet-2.1.4.Final.jar!/:2.1.4.Final]
	at io.undertow.servlet.handlers.ServletChain$1.handleRequest(ServletChain.java:68) [undertow-servlet-2.1.4.Final.jar!/:2.1.4.Final]
	at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36) [undertow-servlet-2.1.4.Final.jar!/:2.1.4.Final]
	at io.undertow.server.handlers.PathHandler.handleRequest(PathHandler.java:91) [undertow-core-2.1.4.Final.jar!/:2.1.4.Final]
	at eu.openanalytics.containerproxy.util.ProxyMappingManager$ProxyPathHandler.handleRequest(ProxyMappingManager.java:160) [containerproxy-0.8.8.jar!/:0.8.8]
	at io.undertow.servlet.handlers.RedirectDirHandler.handleRequest(RedirectDirHandler.java:68) [undertow-servlet-2.1.4.Final.jar!/:2.1.4.Final]
	at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:132) [undertow-servlet-2.1.4.Final.jar!/:2.1.4.Final]
	at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57) [undertow-servlet-2.1.4.Final.jar!/:2.1.4.Final]
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-2.1.4.Final.jar!/:2.1.4.Final]
	at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46) [undertow-core-2.1.4.Final.jar!/:2.1.4.Final]
	at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64) [undertow-servlet-2.1.4.Final.jar!/:2.1.4.Final]
	at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60) [undertow-core-2.1.4.Final.jar!/:2.1.4.Final]
	at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77) [undertow-servlet-2.1.4.Final.jar!/:2.1.4.Final]
	at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43) [undertow-core-2.1.4.Final.jar!/:2.1.4.Final]
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-2.1.4.Final.jar!/:2.1.4.Final]
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-2.1.4.Final.jar!/:2.1.4.Final]
	at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:269) [undertow-servlet-2.1.4.Final.jar!/:2.1.4.Final]
	at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:78) [undertow-servlet-2.1.4.Final.jar!/:2.1.4.Final]
	at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:133) [undertow-servlet-2.1.4.Final.jar!/:2.1.4.Final]
	at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:130) [undertow-servlet-2.1.4.Final.jar!/:2.1.4.Final]
	at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48) [undertow-servlet-2.1.4.Final.jar!/:2.1.4.Final]
	at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43) [undertow-servlet-2.1.4.Final.jar!/:2.1.4.Final]
	at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:249) [undertow-servlet-2.1.4.Final.jar!/:2.1.4.Final]
	at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:78) [undertow-servlet-2.1.4.Final.jar!/:2.1.4.Final]
	at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:99) [undertow-servlet-2.1.4.Final.jar!/:2.1.4.Final]
	at io.undertow.server.Connectors.executeRootHandler(Connectors.java:370) [undertow-core-2.1.4.Final.jar!/:2.1.4.Final]
	at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:836) [undertow-core-2.1.4.Final.jar!/:2.1.4.Final]
	at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35) [jboss-threads-3.1.0.Final.jar!/:3.1.0.Final]
	at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:2019) [jboss-threads-3.1.0.Final.jar!/:3.1.0.Final]
	at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1558) [jboss-threads-3.1.0.Final.jar!/:3.1.0.Final]
	at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1449) [jboss-threads-3.1.0.Final.jar!/:3.1.0.Final]
	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_292]

I can’t figure out anything from the logs. Can some please help me understand what is happening and what is causing the problem? Thanks.