MacBook wont connect to server

i have problem computer can't connect server. don't thin it's network itself, because i'm connected on iphone right typing this. downloaded firefox, , tried use opendns no luck. computer won't connect ichat. i've turned off extensions, emptied cache, reset safari, turned off firewall, , have no proxies enabled. i'm @ loss do, , have found 0 online. when i'm @ home internet connection works fine, it's when come work , try connect other network there problems. use work fine, started of sudden. i'm running mac osx . please help

update:
tried ping websites (even though have no idea does, apprears useful though) facebook, yahoo, aol, , apple. , each got exact same thing.
ping has started...

ping www.apple.com (67.215.65.132): 56 data bytes
request timeout icmp_seq 0
request timeout icmp_seq 1
request timeout icmp_seq 2
request timeout icmp_seq 3
request timeout icmp_seq 4
request timeout icmp_seq 5
request timeout icmp_seq 6
request timeout icmp_seq 7
request timeout icmp_seq 8

--- ping www.apple.com ping statistics ---
10 packets transmitted, 0 packets received, 100.0% packet loss

 

you're resolving dns, you're more getting ip. on forum posting machine you're complaining about?

far ping concerned, blocked corporate firewall. pretty standard practice. try utilities/network utility/traceroute of sites , see returns.

 

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