This might be best taken to the federation support guys.
An obvious candidate in an upgrade to 2.5.0 on Linux is the protection on key material if it is in non standard places, but support will be able to advise.
> -----Original Message-----
> From: Discussion list for Shibboleth developments [mailto:[log in to unmask]] On Behalf Of
> John Lee
> Sent: 30 August 2012 03:41
> To: [log in to unmask]
> Subject: Authentication issue after upgrading to shibboleth-2.5.0-2.1 service provider software
>
> Hi,
>
> We have the Shibboleth Service Provider software running on a RHEL6 box, which is how users are
> authenticated to use our web apps. After performing a regular yum update to upgrade to the latest:
> shibboleth-2.5.0-2.1, it is no longer possible to login to our web apps. On-screen message is:
>
> --------------
> ERROR
> An error occurred while processing your request. Please contact your helpdesk or user ID office for
> assistance.
> This service requires cookies. Please ensure that they are enabled and try your going back to your
> desired resource and trying to login again.
> Use of your browser's back button may cause specific errors that can be resolved by going back to your
> desired resource and trying to login again.
> If you think you were sent here in error, please contact technical support Error Message: Message did
> not meet security requirements
> --------------
>
> Have there been any reports of a similar problem, or any suggestions of what the problem might be.
> I’ve looked in the following log file and have not found anything obvious:
> /var/log/shibboleth/shibd.log
>
> If I downgrade to our original version of the service provider software: shibboleth-2.4.3,
> authentication is fine again.
>
> Regards,
> John
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