Cant't connect to port 80

since i've upgraded my mba late 2010 to yosemite last week, everything went downhill. for the last two days, i couldn't even open any content over http (port 80) whatsoever. every other port to connect to is working (443, 22,...). don't have an active firewall but something's gotta be wrong with the ip stack: wireshark doesn't reveal any request for port 80. wanted to ask u guys for guidance before i up...ehm, downgraded back to mountain lion.
<Edited by Host>

Sadly the forum & the OS are heading the wrong way, imho.
So, no browser works?
Any Proxies set in Network Pref Pane?
Is your hosts file normal?

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