I apologize if this question has already been answered but was unable to find any solutions where someone was experiencing RPC over HTTP problems AFTER getting it working.
I have users connecting to an Exchange 2003 server from multiple locations using Outlook 2003. This has worked flawlessly for many months until recently. No server changes have been made nor have any network changes. About a week ago all of the users connecting remotely started getting many popups about "Outlook is requesting data from the server."
Upon opening Outlook, a connection is made and Outlook with sync with Exchange. However subsequent attempts to sync result in popup messages about requesting data from server. Soemtimes the status bar shows All folders are up to date and other times This folder is up to date. And it will stay there indefinitely.
What I find interesting is that if you do cancel the server request, all of the RPC over HTTP connections are dropped and reestablished and Outlook again goes back in sync. Followed again by popups about Outlook requesting data from the server. If I also close Outlook and reopen it will sync. The initial connections always are successful.
When looking at the Exchange Server Connection Status, the initial attempts show connections with no failures. Req/Fail shows many failures the longer Outlook stays open. Occasionally after very lengthy times Outlook will manage to make a successful connection and get back in sync.
Where can I go to troubleshoot from here? I'm so puzzled as to why this is working on the initial connection and worked so well in the past. I can't seem to find a problem that would only allow intermittent connections.