My Firefox cannot detect the proxy any more after upgrading it to version 31. The proxy setting inside Firefox network option is Auto-detect proxy settings for this network. Before upgrading to version 30 Firefox could detect the proxy without restarting Firefox, but now it cannot detect even with restarting.

Google Chrome can detect it very well.

What can I do to make Firefox discover the proxy again?

2 Answers 2


I had the same issue and had to enable NTLMv1 authentication in the about:config. Follow the instructions in the security section from the Firefox release notes.


My Problem Solved by downgrading to version 30 again!!

  • That’s not exactly a solution, now is it? If you think Firefox is misbehaving, you may well have found a bug. So go report it. :)
    – Daniel B
    Aug 1, 2014 at 7:30

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