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How to avoid anonymous proxy usage?

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Looking at my proxy logs I can see the Mozilla Firefox is sending an anonymous request for a site which fails as anonymous usage is not allowed on the proxy. Firefox then sends a authenticated NTLM request for the same web site which works.

Is there a way of telling Firefox to always use NTLM thus stopping it sending the anonymous request?

Thanks

Looking at my proxy logs I can see the Mozilla Firefox is sending an anonymous request for a site which fails as anonymous usage is not allowed on the proxy. Firefox then sends a authenticated NTLM request for the same web site which works. Is there a way of telling Firefox to always use NTLM thus stopping it sending the anonymous request? Thanks

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In order to change your Firefox Configuration please do the following steps :

  1. In the Location bar, type about:config and press Enter. The about:config "This might void your warranty!" warning page may appear.
  2. Click I'll be careful, I promise! to continue to the about:config page.
  3. search for ntlm and change the entries to true.