Hi All,

 It has been observed randomly on mostly proxy users behind forefront TMG firewall when they access web site they ask for Authentication and when they re-login issues resolves.

For troubleshooting purpose I check other resources like SMB share which works fine.

Hi,

You could try to use the steps in the blog below tp toubleshoot this issue.

Random authentication prompts while accessing internet through ISA Server followed by ISA Server becoming unresponsive

Best Regards,

Joyce