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Sounds like two things.

Check your resolv.conf file and see what your settings are.
Additionally you sound like you may even have routing issues.

if the server has changed sub-networks that could certainly be the case.

Putty, if it has stopped working may need to re-authenticate the box, just login using putty from the workstation / server you send and receive information from – again – and you should be in better shape.

Otherwise, you sound like you just might be having plain old communications problems.