This looks similar to what I encountered earlier and it affects "localhost" 
only.
See another thread: SAML2 service 7.1.x and 7.2.x 
<https://groups.google.com/a/apereo.org/g/cas-user/c/k_8HqC91NXk>. 

On Thursday, 18 September 2025 at 15:46:05 UTC-7 Yan Zhou wrote:

> Hello,
>
> I have CAS 7.2.X war overlay, SAML authN seems broken in 7.2.4, it works 
> in 7.2.3. I have a simple Spring Boot client that uses SAML to authenticate 
> against CAS as server.
>
> With 7.2.4, i am getting Unauthorized App Error when Client app sends SAML 
> AuthN Request to CAS and redirect to CAS URL.  this works in 7.2.3.
>
> I am listing CAS logs for the two different versions. I debugged through 
> the code, it does not seem obvious what maybe the problem in CAS code.
>
> Thanks, 
> Yan
>
> here is the log for 7.2.4, failed due to unauthorized error.
>
> >
> 2025-09-17 12:05:22,847 DEBUG [tomcat-handler-7] 
> [org.apereo.cas.support.saml.SamlUtils] - 
> <********************************************************************************>
> 2025-09-17 12:05:22,854 INFO [tomcat-handler-7] [PROTOCOL_MESSAGE] - <
> ============================================================
> SAML org.opensaml.saml.saml2.core.impl.AuthnRequestImpl
> ============================================================
> <?xml version="1.0" encoding="UTF-8"?><saml2p:AuthnRequest 
> xmlns:saml2p="urn:oasis:names:tc:SAML:2.0:protocol" 
> AssertionConsumerServiceURL="https://localhost:8543/saml/SSO"; 
> Destination="https://localhost:8743/cas/idp/profile/SAML2/POST/SSO"; 
> ForceAuthn="false" ID="aehj5f5dbbg5i6i12df49c4gi38a84" IsPassive="false" 
> IssueInstant="2025-09-17T16:05:20.416Z" 
> ProtocolBinding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" 
> Version="2.0">
>     <saml2:Issuer xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion">
> https://localhost:8543/saml/metadata</saml2:Issuer>
>     <ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#";>
> ..........
>             </ds:X509Data>
>         </ds:KeyInfo>
>     </ds:Signature>
>     <saml2p:NameIDPolicy 
> Format="urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified"/>
> </saml2p:AuthnRequest>
>
> ============================================================>
> 2025-09-17 12:05:22,929 DEBUG [tomcat-handler-7] 
> [org.apereo.cas.support.saml.web.idp.profile.AbstractSamlIdPProfileHandlerController]
>  
> - <Created service url [
> https://localhost:8743/cas/idp/profile/SAML2/Callback?srid=aehj5f5dbbg5i6i12df49c4gi38a84&entityId=https%3A%2F%2Flocalhost...
> ]>
> 2025-09-17 12:05:22,931 DEBUG [tomcat-handler-7] 
> [org.apereo.cas.support.saml.web.idp.profile.AbstractSamlIdPProfileHandlerController]
>  
> - <Redirecting SAML authentication request to [
> https://localhost:8743/cas/login?service=https%3A%2F%2Flocalhost%3A8743%2Fcas%2Fidp%2Fprofile%2FSAML2%2FCallback%3Fsrid%3Daehj5f5dbbg5i6i12df49c4gi38a84%26entityId%3Dhttps%253A%252F%252Flocalhost%253A8543%252Fsaml%252Fmetadata
> ]>
> 2025-09-17 12:05:22,931 DEBUG [tomcat-handler-7] 
> [org.apereo.cas.support.saml.web.idp.profile.AbstractSamlIdPProfileHandlerController]
>  
> - <Redirecting SAML authN request to [
> https://localhost:8743/cas/login?service=https%3A%2F%2Flocalhost%3A8743%2Fcas%2Fidp%2Fprofile%2FSAML2%2FCallback%3Fsrid%3Daehj5f5dbbg5i6i12df49c4gi38a84%26entityId%3Dhttps%253A%252F%252Flocalhost%253A8543%252Fsaml%252Fmetadata
> ]>
> 2025-09-17 12:05:23,019 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.web.flow.CasFlowHandlerMapping] - <Mapped to 
> [FlowHandlerMapping.DefaultFlowHandler@49ffbe04]>
> 2025-09-17 12:05:23,026 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.web.flow.CasFlowHandlerAdapter] - <Configuring CAS webflow 
> execution plan...>
> 2025-09-17 12:05:23,103 INFO [scheduling-9] 
> [org.apereo.cas.services.mgmt.AbstractServicesManager] - <Loaded [3] 
> service(s) from cache [JsonServiceRegistry].>
> 2025-09-17 12:05:23,114 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.web.flow.configurer.AbstractCasMultifactorWebflowConfigurer] 
> - <Unable to locate state definition [delegatedAuthentication] in flow 
> [mfa-simple]>
> 2025-09-17 12:05:23,115 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.web.flow.configurer.AbstractCasWebflowConfigurer] - 
> <[OidcWebflowConfigurer] could not find flow definition [account]. 
> Available flow definition ids are [[clientredirect, login, logout, 
> mfa-simple]]>
> 2025-09-17 12:05:23,330 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.web.flow.login.InitialFlowSetupAction] - <Setting path for 
> cookies for warn cookie generator to: [/cas/]>
> 2025-09-17 12:05:23,330 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.web.flow.login.InitialFlowSetupAction] - <Setting path for 
> cookies for TGC cookie generator to: [/cas/]>
> 2025-09-17 12:05:23,333 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.web.flow.login.InitialFlowSetupAction] - <Placing service 
> in context scope: [
> https://localhost:8743/cas/idp/profile/SAML2/Callback?srid=aehj5f5dbbg5i6i12df49c4gi38a84&entityId=https%3A%2F%2Flocalhost%3A8543%2Fsaml%2Fmetadata
> ]>
> 2025-09-17 12:05:23,342 WARN [tomcat-handler-10] 
> [org.apereo.cas.services.RegisteredServiceAccessStrategyUtils] - 
> <Unauthorized Service Access. Service [
> https://localhost:8743/cas/idp/profile/SAML2/Callback?srid=aehj5f5dbbg5i6i12df49c4gi38a84&entityId=https%3A%2F%2Flocalhost%3A8543%2Fsaml%2Fmetadata]
>  
> is not registered in the service registry. Review the service access 
> strategy to evaluate policies required for service access>
>
> here is the log for 7.2.3, working fine. 
>
> 2025-09-17 12:09:31,992 DEBUG [tomcat-handler-9] 
> [org.apereo.cas.support.saml.SamlUtils] - <Logging 
> [org.opensaml.saml.saml2.core.impl.AuthnRequestImpl]
>
> [<?xml version="1.0" encoding="UTF-8"?><saml2p:AuthnRequest 
> xmlns:saml2p="urn:oasis:names:tc:SAML:2.0:protocol" 
> AssertionConsumerServiceURL="https://localhost:8543/saml/SSO"; 
> Destination="https://localhost:8743/cas/idp/profile/SAML2/POST/SSO"; 
> ForceAuthn="false" ID="a5af4e8dia2h4216478632h1b086c6" IsPassive="false" 
> IssueInstant="2025-09-17T16:09:27.741Z" 
> ProtocolBinding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" 
> Version="2.0">
>     <saml2:Issuer xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion">
> https://localhost:8543/saml/metadata</saml2:Issuer>
> .............
>     </ds:Signature>
>     <saml2p:NameIDPolicy 
> Format="urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified"/>
> </saml2p:AuthnRequest>
> ]
>
> >
> 2025-09-17 12:09:31,992 DEBUG [tomcat-handler-9] 
> [org.apereo.cas.support.saml.SamlUtils] - 
> <********************************************************************************>
> 2025-09-17 12:09:32,001 INFO [tomcat-handler-9] [PROTOCOL_MESSAGE] - <
> ============================================================
> SAML org.opensaml.saml.saml2.core.impl.AuthnRequestImpl
> ============================================================
> <?xml version="1.0" encoding="UTF-8"?><saml2p:AuthnRequest 
> xmlns:saml2p="urn:oasis:names:tc:SAML:2.0:protocol" 
> AssertionConsumerServiceURL="https://localhost:8543/saml/SSO"; 
> Destination="https://localhost:8743/cas/idp/profile/SAML2/POST/SSO"; 
> ForceAuthn="false" ID="a5af4e8dia2h4216478632h1b086c6" IsPassive="false" 
> IssueInstant="2025-09-17T16:09:27.741Z" 
> ProtocolBinding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" 
> Version="2.0">
>     <saml2:Issuer xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion">
> https://localhost:8543/saml/metadata</saml2:Issuer>
>    ..........................
>     
>     <saml2p:NameIDPolicy 
> Format="urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified"/>
> </saml2p:AuthnRequest>
>
> ============================================================>
> 2025-09-17 12:09:32,070 DEBUG [tomcat-handler-9] 
> [org.apereo.cas.support.saml.web.idp.profile.AbstractSamlIdPProfileHandlerController]
>  
> - <Created service url [
> https://localhost:8743/cas/idp/profile/SAML2/Callback?srid=a5af4e8dia2h4216478632h1b086c6&entityId=https%3A%2F%2Flocalhost...
> ]>
> 2025-09-17 12:09:32,072 DEBUG [tomcat-handler-9] 
> [org.apereo.cas.support.saml.web.idp.profile.AbstractSamlIdPProfileHandlerController]
>  
> - <Redirecting SAML authentication request to [
> https://localhost:8743/cas/login?service=https%3A%2F%2Flocalhost%3A8743%2Fcas%2Fidp%2Fprofile%2FSAML2%2FCallback%3Fsrid%3Da5af4e8dia2h4216478632h1b086c6%26entityId%3Dhttps%253A%252F%252Flocalhost%253A8543%252Fsaml%252Fmetadata
> ]>
> 2025-09-17 12:09:32,072 DEBUG [tomcat-handler-9] 
> [org.apereo.cas.support.saml.web.idp.profile.AbstractSamlIdPProfileHandlerController]
>  
> - <Redirecting SAML authN request to [
> https://localhost:8743/cas/login?service=https%3A%2F%2Flocalhost%3A8743%2Fcas%2Fidp%2Fprofile%2FSAML2%2FCallback%3Fsrid%3Da5af4e8dia2h4216478632h1b086c6%26entityId%3Dhttps%253A%252F%252Flocalhost%253A8543%252Fsaml%252Fmetadata
> ]>
> 2025-09-17 12:09:32,158 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.web.flow.CasFlowHandlerMapping] - <Mapped to 
> [FlowHandlerMapping.DefaultFlowHandler@4830d7e2]>
> 2025-09-17 12:09:32,163 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.support.saml.services.idp.metadata.SamlRegisteredServiceMetadataAdaptor]
>  
> - <Locating metadata for entityID [https://localhost:8543/saml/metadata] 
> by attempting to run through the metadata chain...>
> 2025-09-17 12:09:32,165 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.support.saml.services.idp.metadata.cache.SamlRegisteredServiceDefaultCachingMetadataResolver]
>  
> - <Resolving metadata for [samlsp] at 
> [file:///D:/installedApps/tools/casconfig/sp-metadata/springsp_saml_metadata.xml]>
> 2025-09-17 12:09:32,165 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.support.saml.services.idp.metadata.cache.SamlRegisteredServiceDefaultCachingMetadataResolver]
>  
> - <Locating cached metadata resolver using key 
> [f9e5132b7e2b93144b67bb2a6fecf673b0f63d32a8fdf68b6677a3d1bc4e4e671e8dc67697d9e495825f94d1b078b229619cf145d485a241a91ef28cbfdb31d7]
>  
> for service [samlsp]. Attempt [0]>
> 2025-09-17 12:09:32,166 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.support.saml.services.idp.metadata.SamlRegisteredServiceMetadataAdaptor]
>  
> - <Resolved metadata chain from 
> [file:///D:/installedApps/tools/casconfig/sp-metadata/springsp_saml_metadata.xml]
>  
> using [org.opensaml.saml.metadata.resolver.ChainingMetadataResolver]. 
> Filtering the chain by entity ID [https://localhost:8543/saml/metadata]>
> 2025-09-17 12:09:32,166 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.support.saml.services.idp.metadata.SamlRegisteredServiceMetadataAdaptor]
>  
> - <Located SP SSODescriptor in metadata for [
> https://localhost:8543/saml/metadata]. Metadata is valid until [forever]>
> 2025-09-17 12:09:32,169 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.web.flow.CasFlowHandlerAdapter] - <Configuring CAS webflow 
> execution plan...>
> 2025-09-17 12:09:32,245 INFO [scheduling-9] 
> [org.apereo.cas.services.mgmt.AbstractServicesManager] - <Loaded [3] 
> service(s) from cache [JsonServiceRegistry].>
> 2025-09-17 12:09:32,255 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.web.flow.configurer.AbstractCasMultifactorWebflowConfigurer] 
> - <Unable to locate state definition [delegatedAuthentication] in flow 
> [mfa-simple]>
> 2025-09-17 12:09:32,256 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.web.flow.configurer.AbstractCasWebflowConfigurer] - 
> <[OidcWebflowConfigurer] could not find flow definition [account]. 
> Available flow definition ids are [[clientredirect, login, logout, 
> mfa-simple]]>
> 2025-09-17 12:09:32,454 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.web.flow.login.InitialFlowSetupAction] - <Setting path for 
> cookies for warn cookie generator to: [/cas/]>
> 2025-09-17 12:09:32,454 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.web.flow.login.InitialFlowSetupAction] - <Setting path for 
> cookies for TGC cookie generator to: [/cas/]>
> 2025-09-17 12:09:32,457 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.web.flow.login.InitialFlowSetupAction] - <Placing service 
> in context scope: [
> https://localhost:8743/cas/idp/profile/SAML2/Callback?srid=a5af4e8dia2h4216478632h1b086c6&entityId=https%3A%2F%2Flocalhost%3A8543%2Fsaml%2Fmetadata
> ]>
> 2025-09-17 12:09:32,459 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.support.saml.services.idp.metadata.SamlRegisteredServiceMetadataAdaptor]
>  
> - <Locating metadata for entityID [https://localhost:8543/saml/metadata] 
> by attempting to run through the metadata chain...>
> 2025-09-17 12:09:32,461 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.support.saml.services.idp.metadata.cache.SamlRegisteredServiceDefaultCachingMetadataResolver]
>  
> - <Resolving metadata for [samlsp] at 
> [file:///D:/installedApps/tools/casconfig/sp-metadata/springsp_saml_metadata.xml]>
> 2025-09-17 12:09:32,461 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.support.saml.services.idp.metadata.cache.SamlRegisteredServiceDefaultCachingMetadataResolver]
>  
> - <Locating cached metadata resolver using key 
> [f9e5132b7e2b93144b67bb2a6fecf673b0f63d32a8fdf68b6677a3d1bc4e4e671e8dc67697d9e495825f94d1b078b229619cf145d485a241a91ef28cbfdb31d7]
>  
> for service [samlsp]. Attempt [0]>
> 2025-09-17 12:09:32,462 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.support.saml.services.idp.metadata.SamlRegisteredServiceMetadataAdaptor]
>  
> - <Resolved metadata chain from 
> [file:///D:/installedApps/tools/casconfig/sp-metadata/springsp_saml_metadata.xml]
>  
> using [org.opensaml.saml.metadata.resolver.ChainingMetadataResolver]. 
> Filtering the chain by entity ID [https://localhost:8543/saml/metadata]>
> 2025-09-17 12:09:32,462 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.support.saml.services.idp.metadata.SamlRegisteredServiceMetadataAdaptor]
>  
> - <Located SP SSODescriptor in metadata for [
> https://localhost:8543/saml/metadata]. Metadata is valid until [forever]>
> 2025-09-17 12:09:32,465 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.support.saml.services.idp.metadata.SamlRegisteredServiceMetadataAdaptor]
>  
> - <Locating metadata for entityID [https://localhost:8543/saml/metadata] 
> by attempting to run through the metadata chain...>
> 2025-09-17 12:09:32,467 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.support.saml.services.idp.metadata.cache.SamlRegisteredServiceDefaultCachingMetadataResolver]
>  
> - <Resolving metadata for [samlsp] at 
> [file:///D:/installedApps/tools/casconfig/sp-metadata/springsp_saml_metadata.xml]>
> 2025-09-17 12:09:32,468 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.support.saml.services.idp.metadata.cache.SamlRegisteredServiceDefaultCachingMetadataResolver]
>  
> - <Locating cached metadata resolver using key 
> [f9e5132b7e2b93144b67bb2a6fecf673b0f63d32a8fdf68b6677a3d1bc4e4e671e8dc67697d9e495825f94d1b078b229619cf145d485a241a91ef28cbfdb31d7]
>  
> for service [samlsp]. Attempt [0]>
> 2025-09-17 12:09:32,468 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.support.saml.services.idp.metadata.SamlRegisteredServiceMetadataAdaptor]
>  
> - <Resolved metadata chain from 
> [file:///D:/installedApps/tools/casconfig/sp-metadata/springsp_saml_metadata.xml]
>  
> using [org.opensaml.saml.metadata.resolver.ChainingMetadataResolver]. 
> Filtering the chain by entity ID [https://localhost:8543/saml/metadata]>
> 2025-09-17 12:09:32,468 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.support.saml.services.idp.metadata.SamlRegisteredServiceMetadataAdaptor]
>  
> - <Located SP SSODescriptor in metadata for [
> https://localhost:8543/saml/metadata]. Metadata is valid until [forever]>
> 2025-09-17 12:09:32,468 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.web.flow.login.InitialFlowSetupAction] - <Placing 
> registered service [https://localhost:8543/saml/metadata] with id [1003] 
> in context scope>
> 2025-09-17 12:09:32,475 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.web.flow.authentication.RegisteredServiceAuthenticationPolicySingleSignOnParticipationStrategy]
>  
> - <Evaluating authentication policy 
> [DefaultRegisteredServiceAuthenticationPolicy(requiredAuthenticationHandlers=[],
>  
> excludedAuthenticationHandlers=[], criteria=null)] for [samlsp]>
> 2025-09-17 12:09:32,870 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.web.flow.actions.DelegatedClientAuthenticationAction] - 
> <Setting path for cookies for distributed session cookie generator to: 
> [/cas/]>
> 2025-09-17 12:09:32,890 DEBUG [tomcat-handler-10] 
> [org.apereo.cas.web.flow.resolver.impl.AbstractCasWebflowEventResolver] - 
> <Resolved single event [success] via 
> [org.apereo.cas.web.flow.resolver.impl.RankedMultifactorAuthenticationProviderWebflowEventResolver]
>  
> for this context>
> 2025-09-17 12:09:32,895 INFO [tomcat-handler-10] 
> [org.apereo.inspektr.audit.AuditTrailManager] - <Audit trail record BEGIN
> =============================================================
> WHEN: 2025-09-17T16:09:32.894204900
>

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