There is a very long thread here in the forum on this problem.

One possible cause, at least on Windows, is your proxy settings. If you check this deeply buried dialog, you may be able to correct it:

Firefox > Preferences > Advanced > Network

Click the "Settings" button and choose either "No Proxy" or "Use System Settings" option, and OK the change. See whether that helps.

More suggestions here: https://support.mozilla.org/en-US/questions/928922#answer-339570

Dear jscher2000, Thank you for your solution. I altered my proxy setting in Firefox to "NO Proxy" then it seems fixed my annoying problem with yahoo mail. You have made my day !!! Thank you for you help, much appreciated  !!!!!! Noir9

Hi, I am having this same issue too. SO ANNOYING! I can't seem to find "preferences" in Windows though, which is strange. can someone help? thanks!

Firefox > Preferences is the menu path for a Mac computer.

On Windows you can use Firefox > Options in you have the orange Firefox button or Tools > Options if the menu bar is visible.

• https://support.mozilla.org/kb/Options+window

thank you! i switched to NO proxy...we'll see if that works!

Thanks for your help! This appears to have worked for me!

Bill

I had the same problem and the No proxy setting appears to work. Thanks!!

Thank you - I did what you said on my Mac and it worked! Thanks so much. Chris

So when I go to Firefox I can't find "preferences"! I am a techno-dummy! Where is it? yahoo is driving me crazy with reconfirming my password! Steph

Press F10 if the menu bar is hidden on Windows and Linux or use "Firefox > Options"

• https://support.mozilla.org/kb/Options+window+-+Advanced+panel

Hi stephmelle

I had to same problem and fixed it in this way and hopefully this will work for you as well. Start Firefox and then click on the following:

tools->settings->advanced->network tab->-settings button->then select the radio button labeled "No Proxy" then click OK OK and then restart FireFox and then your Yahoo email.

Good Luck!