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I surf Stack Overflow using a proxy server with Firefox 13.

What I am noticing in the past month, is that whenever I post an answer, it shows an Invalid/Bad Request error.

In this case, I click my browser's back button and then click it. It redirects to the CAPTCHA page and then my answer gets submitted.

This always happens, and sometimes while voting and commenting too. I dont know what is going through the website. It was pretty good previously.

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Try google-chrome, it is best supported explorer for S.O. – Lucifer Jul 25 '12 at 7:47
    
@Lucifer most likely the problem is the proxy server blocking stuff. Kamal - can you monitor the network traffic using Firebug and see what's happening? – Shadow Wizard Jul 25 '12 at 7:49
    
Yes, i agree, it may be possible that his speed get decreased. – Lucifer Jul 25 '12 at 7:52
    
@ShaWizDowArd Ok i will check using Firebug – Kamal Deep Singh Jul 25 '12 at 7:54

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