Memo# Couldn't get access to stackoverflow.com

I couldn't get access to stackoverflow.com almost all the days (only about an hour in the evening, its fine)

- downforeveryorjustme says its down there too
- but just-ping says its almost fine from most place
- it could be my company banned it for local machines
- superuser and serverfault got banned page, but stackovflow and meta aren't, just got

The remote server refuses to perform the request. This address is not available.

- I got it works around 1 hours with Opera Turbo.
- It could be my company banned Opera Turbo too, but some others site like whatismyipaddress.com are fine with Opera Turbo
- Or Stackoverflow banned Opera Turbo? may be because of high traffic on same ip (because its shared by many users?)
- I got 1 hour ok, so its mean banning is not permanent, may be just for few hours for high traffic?

still no clue till now. hopes it will be ok later. or I need to tunnel something with my servers.