Outlook 2010 losing connection to Exchange 2010 server when sending and opening calendar events

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Jaison Stein

I posted this originally in the Exchange 2010 forum, however, I guess I should be here. Here's the original thread. I've narrowed it down to the Microsoft Exchange Add-In that is causing the hang up.


Good Day,

My group (and some of my clients as well) appear to be having a problem that right now my hosting provider can not resolve and i can not find an answer on Google yet. Thought I would bring it to the experts, hopefully this is the correct forum.

We run a hosted exchange server (through Verio), we were on Exchange 2007 and had a mix of Outlook 2000/03/07/10 clients; no problems.

We upgraded to a 2010 Exchange Server. We removed our profiles and created new profiles on our client computers (of course exported our OST/PST files before doing so).

Clients that are using Outlook 2000/03/07 are fine.

The issue we have is with our clients running Outlook 2010. We loose connection to the server when we send emails and are opening up previously created calendar events and when sending new emails. This of course hangs up Outlook for about 30-60 seconds. The connection is re-established and all is well until we repeat the same steps. Obviously, this is frustrating. One of my clients who was on Outlook 2003 upgraded to Outlook 2010 started experiencing the same issue after upgrading. he downloaded to Outlook 2003 and is happy now. Obviously, it appears to be something with Outlook 2010.

Any ideas? I've looked up and down, right and left and don't seem to find anything. My OST files are in the new Unicode format, i even uninstalled my A/V s/w.

Harry Yuan


From your description , I understand that your Outlook 2010 client failed to connect to Exchange server when sending and opening calendar events.

To resolve this issue, use one of the following methods:

Method 1

1. Click Start, click Run, type drivers, and then click OK.

2. Click the etc folder, and then open the hosts file.

3. Locate the string ::1 and remark the string to #::1.

4. Restart the Exchange server.

Method 2

1. Open the network adapter properties.

2. Click to select the Internet Protocol Version 6 (TCP/IPv6) option.

3. Restart the Exchange server.



Jaison Stein


I do not have access to the Exchange server in that way, as it's being hosted by Verio. We do not have a dedicated Exchange server.

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