We have a ultimate hosting plan and around 10 domains hosted. all sites are not working with one isp(Bsnl india) We contacted customer care and they said they are helpless and tell us to call ISP.
we contacted isp they said
"Since trace is reaching it is not a network issue , It may be a blacklist at the server side
Hi @lijukarolil. Thanks for posting. That does sound like a frustrating situation. Troubleshooting network connections can be difficult at times. If a website is loading with other ISPs, that's usually an indication that the problem is with the ISP having the issue. In most cases, if you see issues with your connections that occur prior to arriving at secureserver.net names, then it is outside of GoDaddy's control. Those are the servers that GoDaddy controls. If you're still having trouble, you can post your traceroute here. That may help others in the community offer suggestions on how you can move forward.
to overcome this one the call center executive suggest to put static IP address this may solve the issue.
also, she said this ip will automatically update all the addon domains. both not happened. I sit & changed ip manually. following are the latest support details. they confirm its problem with isp
In India its difficult to contact isp like BSNL and ask to solve the issue for all customers.
practically its not possible
for all domains to work other networks also