An exception occurred when trying to issue security token: The security token username and password could not be validated..

SharePoint 2010 Claims Authentication. FBA.

Every time now and then, it failed to authenticate users

Here are the errors:

An exception occurred when trying to issue security token: The security token username and password could not be validated..

Request for security token failed with exception: System.ServiceModel.FaultException: The security token username and password could not be validated.     at Microsoft.IdentityModel.Protocols.WSTrust.WSTrustChannel.ReadResponse(Message response)     at Microsoft.IdentityModel.Protocols.WSTrust.WSTrustChannel.Issue(RequestSecurityToken rst, RequestSecurityTokenResponse& rstr)     at Microsoft.IdentityModel.Protocols.WSTrust.WSTrustChannel.Issue(RequestSecurityToken rst)     at Microsoft.SharePoint.SPSecurityContext.SecurityTokenForContext(Uri context, Boolean bearerToken, SecurityToken onBehalfOf, SecurityToken actAs, SecurityToken delegateTo)

SPSecurityTokenService.Issue() failed: System.ServiceModel.FaultException`1[Microsoft.IdentityModel.Tokens.FailedAuthenticationException]: The security token username and password could not be validated. (Fault Detail is equal to Microsoft.IdentityModel.Tokens.FailedAuthenticationException: The security token username and password could not be validated.).

 

Password check on ‘NETWORKID‘ generated exception: ‘System.ServiceModel.FaultException`1[Microsoft.IdentityModel.Tokens.FailedAuthenticationException]: The security token username and password could not be validated. (Fault Detail is equal to Microsoft.IdentityModel.Tokens.FailedAuthenticationException: The security token username and password could not be validated.).’.

 

Recycling the application pools does help. Or restart IIS.

Still trying to figure the real cause.

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