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Outlook cannot log on.  Verify you are connected to the network

visualutions asked
I have a single Exchange 2010 server installed.  All users connect to email by using Win2K3 standard terminal servers to access outlook.  By random selected, some users have not been able to access their email.  They can log into any of the terminal servers and have the same issue.  Also there are working users on the same termin al servers.

When trying to setup user I get the following error:

Outlook cannot log on. Verify you are connected to the network and are using proper server and mailbox name.  The connection to Microsoft Exchange is unavailable.  Outlook must be online or connected to complete this action.

I have tried everything I can think of to fix this issue.

Brief history:

We orginally had an Exchange 2000 server.
We upgrade it to 2003 and removed the 2000 server
We then deployed 2010, migrated mailboxes and removed the 2003 server.

This problem was happening ever since we moved to 2003.  We thought that moving everything to 2010 would resolve the issue.  Which it did not.


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Vishal BreedProgram Manager

Upgrading to new version of exchange is not a solution to mentioned problem! Besides exchange problem, there are many issues which can cause this issue.

As you have mentioned, you are using Terminal services to access outlook, please check following things,
- how many network adapters does this terminal server has?
- disable inactive adapters
- in network connetions (properties of 'my netowrk places'), advanced menu - adavanced settings
- move the active adapter on top.

Besides this, check if terminal server is able to resolve AD and Exchange server using nslookup.


As I had mentioned before, 20 others users on the same server are using exchange.  Also I can try when no one is using the server and have the same result.

I have physical and vmware virtual machines as terminal servers.  Issue happens on all machines.
Vishal BreedProgram Manager

This is known as intermittent problem. There is no issue with exchange. Please check the settings I have suggested. I have faced such problems and have resolved!


There is only one nic on the terminal servers.  

I don't see how the problem is intermittent if it happens every time.

I've got a similar issue to you at the moment


Have you ahd any joy? Is your issue specific to users on your terminal server?

This may be relevant http://support.microsoft.com/?kbid=319206


It happens on physical terminal servers and virtual

The MS article did not help


It also happens for any new user I create.
I have the same issue - 10 Users are fine but one cannot get Outlook 2010 to connect to the new Exchange 2010 server. They are able to use all other applications including Outlook 2003 on a different Terminal Server
I had to delete their ad account and profile in order to get them to work.

But they are all working now.
make sure DNS is setup properly, you can try pointing DNS to your DC from the client
even though it should be pulling it out automatically...
I tried that and it worked for me

I have remvoed the Encryption of RPC from Outlook Configuration and it worked fine, though my CAS servers have RPC encryption enabled