Problem resolving host - Fedora behind proxy server
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proxy is just that - an application layer tool to handle a given type of
requests. It handles http/https. ping is not tcp, it's low-level ip, and
the proxy knows nothing about it. To be able to ping you need a default
router/gateway set-up, and its firewall needs to permit your ICMP traffic.
My advice at this stage is to contact your network administrator.
From what I can see there is no configuration issue - but your box for some reason cannot resolve host names. The proxy would not return this kind of error - but rather something like "Unable to connect" or "Connection Refused".
Maybe your DNS is down/not working - and you need to change to a different DNS - which your admin could help you with.