It is you and not ihub that is having the problem. I speculate one or both of the DNS servers in your configuration died or you are experiencing problems reaching them.
Not sure what OS you're running, but if you drop to a "DOS" prompt and run ipconfig /all you will get the IP address of your DNS servers. I would ping them during times like when you have problems.
I further surmise you are using dynamic addressing (DHCP) and not static.
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