I work on a Domain environment, Windows 2008 server is a DC and dns- Sonicfirewall- VOIP phone system, and all comes to a halt at certain times.... at one time we had a Denial of service attack and have since changed the public IP-
Have 6 servers running Windows 2008-
Don't suppose there is a backup running at the time of the slowdown lets say for EG an online backup?
What do you use for a backup does it backup out onto the cloud?
Can you give more information on grinds to a halt? are internal ping responses slow? external ping responses slow?
What are your main symptoms here for grinding to a halt?