netdom query pdc fails on Domain controller

One of the domain child controller fails when I run netdom query/D:abc.example.com PDC. The output is: C:\Users\username>netdom query /D:abc.example.com PDC The specified domain either does not exist or could not be contacted. The command failed to complete successfully. What are the possible reasons for that error? What DNS records should exists for it work correctly?…

Apache connections stuck on “sending reply” and high mysql load

Apache on my dedicated server constantly hangs due to connections being stuck in a state of “sending reply”: Apache status: connections stuck in “Sending Reply” This happens at least several times a day – sometimes it won’t happen for 2 or 3 hours, sometimes it’ll happen constantly to the point where all connections will be…