I had an interesting report from a customer today that they were receiving Digital signature has expired errors when using Forefront UAG with certain browsers that use the Java version of the endpoint client components.
I managed to reproduce this pretty quickly using Firefox as shown below:
Having spoken to a support colleague at Microsoft, they confirmed that some of the Java Client Components have a digital signature that expired on March 23rd 2012.
We are awaiting an update from the Product Group…I will update this post once I hear more!
UPDATE: This problem has been fixed in UAG Service Pack 2 available here.