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Exchange 2010 User Cannot Connect until RPC service restart

Hi,

I have a strange situation that a single random user cannot open there mailbox, everything that i do in the client not work(restart computer,create new outlook profile,check dns,etc..) but when i restart only the Microsoft Exchange RPC Client Access on the EX server everything works good.  I've checked event log in the EX server nothing in there that I see.

Exchange Server 2010
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DerekFG
Asked:
DerekFG
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1 Solution
 
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
So you have single Exchange with all Roles ... right

Are users in Outlook cache or Online ?
Are they able to access their mailbox data via OWA ?

- Rancy
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DerekFGAuthor Commented:
Single Exchange, all roles.

Cached Mode

Yes, they can access via OWA.

It's really only one user that this happens to, and i've ran checks on his mailbox.  I even at a point re-created his entire AD/Email account.

It will all of a sudden just start prompting him for password, not opening, then if I restart that service all is fine.  I've not had complaints from any other user (105 in total).
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
If OWA is accessibe than dont think there is any issue on the server :)

If the issue isnt happening to all users ... then it doesnt seems to be Server issue.
What if you restart the Users machine .... is he able to Ping the Exchange and GC at that time ?
What if you run Tracert from the client to Exchange server is there any block ?

- Rancy
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DerekFGAuthor Commented:
Restarting the machine does nothing.  He can ping the GC and Exchange box no problem, all of his mapped drives, etc work just fine.

No block while doing a Tracert.

It has me stumped.  

I was thinking it was server related since restarting that one service brings him back online right away.
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Humm .... is there any AV on the server and if there are some 9646 for those specific users need to check with their Outlook surely .... as you say not everyone is affected doesnt seems to be a server issue though :(
Are these users on a different swicth \ Laptop users \ User differenet LAN to connect .... not sure what else we can check .....

Make sure AV excludes Scanning Exchange related stuff and we have the Registry for AV set to Disable "Virus Scan"

- Rancy
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DerekFGAuthor Commented:
http://social.technet.microsoft.com/Forums/en-US/exchange2010/thread/91922b60-38b7-4af3-ba13-3b44949cc9f7

Ended up being the issue, I upped the value from 32 to 640, which, I don't think will totally clear it up, or will it?
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Making it to 640 your actually saying allow 640 sessions per user ? That isnt good ...... the event ID always has which user is facing the issue ... if its one or 2 why not check why is their Outlook trying to make so many sessions ?

I would suggest to keep it to around 64 thats double of what the default is :) ..... many connections as you too know can hamper Performance of the Server.

- Rancy
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DerekFGAuthor Commented:
It actually is at 64, not sure why I typed 640.  We are looking into why his Outlook client is creating so many sessions, and yes it is just the one user have the problem.
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