📣 Help shape Firefox by joining our Test Days event on July 21–Aug 1 to test the Firefox Semantic History Search in Firefox Beta 142

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

I get a "Bad Request Error 400" when trying to get to Gmail. I am running Firefox 3.6.16. No problems getting to other pages or getting to Gmail through IE (ick).

  • 4 replies
  • 49 have this problem
  • 164 views
  • Last reply by Hulk314

I am running XP and Firefox 3.6.16. Problem started in middle of day, nothing else that I can point to that might have triggered it. Have restarted and that doesn't work either. Doesn't seem to have affected other sites.

I am running XP and Firefox 3.6.16. Problem started in middle of day, nothing else that I can point to that might have triggered it. Have restarted and that doesn't work either. Doesn't seem to have affected other sites.

Chosen solution

This issue can be caused by corrupted cookies.

Try to clear the cache and the cookies from sites that cause problems.

  • "Clear the Cache": Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"
  • "Remove the Cookies" from sites causing problems: Tools > Options > Privacy > Cookies: "Show Cookies"
Read this answer in context 👍 6

All Replies (4)

Chosen Solution

This issue can be caused by corrupted cookies.

Try to clear the cache and the cookies from sites that cause problems.

  • "Clear the Cache": Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"
  • "Remove the Cookies" from sites causing problems: Tools > Options > Privacy > Cookies: "Show Cookies"

Thanks, removing the cookies did the trick.

You're welcome

Bei mir war in den Einstellungen für die Internetverbindung die Option "Proxy-Einstellungen des Systems" gesetzt. Nach dem Setzen der Option "Kein Proxy verwenden" konnte ich wieder alle Internetseiten erreichen (Wahrscheinlich wurde die Änderung durch ein Programm verursacht, dass die Internetverbindung optimieren sollte).