Public Folder not accessible from outlook for a number of users(Impacted users Expanding)

Hi ,

We have a Exchange 2013 Server with both Mailbox and Cas Roles in it. We are currently migrating the mailboxes to a new server as the old one had some OS issue.

We use a number of Public folder, since the past two days, a number of users are not able to access public folders from outlook 2013( able to access through OWA) The issue is expanding to other users now. Please let me know some options to arrest this and resolve the same.

When I try to check for any issues from ECP. I go to the public folder and click manage, I get the 505 error. Pls help

Thanks,

Vivek