My Domains become randomly unavailable for short periods
Some of my Linux(WHM/Cpanel) hosted domains have a weird problem. They randomly become unavailable to me for periods of half hour to 2 hours. During this time I get a server not found error and I cannot access the domains through FTP either. However if I use a proxy or try to reach the domain through another server using RDC I am able to reach it.
What could be going wrong? Can you help me resolve this issue please?
Most likely either your name server or your ISP is having DNS issues. You might consider testing with OpenDNS for a few days, just to see if it is an ISP issue. OpenDNS.org is where you will want to look. Basically, it takes your DNS requests and forwards them to their servers instead of your ISP's. This will help isolate where the problem lays.
If it works with OpenDNS, it is an ISP issue. If it does not, it might be a name server issue.
Let us know if this helps. We'll be able to help you troubleshoot further from there.