procopy

I got a reseller plan hosting ~20-25 domains. Three days ago I moved to a new home and switched to a new ISP. At first I noticed there was some delay opening few of those sites and then, yesterday, all of a sudden I wasn't able to access any of those - no web, no mail, no nothing. They are simply not resolving. Local traceroute and ping are not getting anything.

Today I found out that only my master domain is resolving and working. I can also access all other domains using IP/~domainname. Got ISP support on the phone, they told me there are no bans or restrictions associated with my IP, so the problem is not on their side. After that I fired a ticket at Surpass and surprise - there seems to be nothing wrong there either. I have absolutely no idea how is it possible - all domains are using the same nameservers and are hosted within the same reseller account.

And here I am, flushing DNS' like crazy, restarting computers and routers, refreshing browser tabs and stuff, and still unable to load anything besides the master domain, which also disappeared for few hours today, but came back later on.

The good thing about this is all domains are accessible from elsewhere, so the problem should be either in my ISP or Surpass. But which one is it and what's the cause?

Rick

If you can access your domains from other ISPs and you can access them with the IP/~accountname from your ISP then it sounds like a DNS problem with your ISP. My favorite method of checking DNS issuses is to add the domain name and IP address to your HOST file. On Windows XP and Vista it's located at C:\WINDOWS\system32\drivers\etc\hosts (I'm not sure about Windows 7). If your domains are accessible with them in the HOST file then it's probably a problem with you ISPs DNS servers. Also, if you continually have problems with your ISP's DNS servers you can bypass them with an alternative DNS service like OpenDNS.

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Unregistered

Thanks alot. That is really useful, will try both methods should the problem occur again. Sites came back on late last night, let's see how long will they stay...