Btempleton   45 pts.  |   Jul 30 2009  8:02PM GMT

I am having a problem that is a variation on this theme. I have a Windows 2003 server that is a virtual host running Microsoft Virtual Server 2205 R2. The guest server is a windows 2000 server that runs Exchange 2005. For the last 2 days, the guest server has been losing the connection to the domain intermittantly. I can ping both of the domain servers from the guest server. I have to reboot the guest server to re-establish the connection to the domain. Without the domain connection, Exchange does not work.

Mshen   23535 pts.  |   Jul 31 2009  1:39AM GMT

Until recently, Microsoft would not support Exchange running on a virtual server. Check you IO activity on the host, but your best bet is to put exchange on a physical server.

Btempleton   45 pts.  |   Aug 28 2009  4:52PM GMT

Sorry, I typed my input in the wrong place and appended it to Minman66’s answer.

As I noted earlier, I have a similar problem. It is very intermittent. I can go for 2 weeks with no problem and then lose the domain every couple of hours for 2 or 3 days.

Here is what I have discovered so far.

1. If you to a cmd prompt on the Exchange Virtual Machine and give the command “ipconfig /flushdns” followed by “ipconfig /registerdns”. That usually restore the connection.

2. If that doesn’t work I go to the DCs (I have 2 of them) and run dcdiag /fix and netdiag /fix. Usually the combination of these commands reconnects everything without rebooting servers.

The errors I get from dcdiag are that all all domain controllers are in use or not responding and LDAP Bind was unsuccessful on directory <a href="http://server.domain.com" title="http://server.domain. " target="_blank">server.domain.com</a> for distinguished name”

The errors from netdiag are LDAP test failed to query SPN registration on DC,

Can anyone tell me what to do to fix this?