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Your request is prohibited because it would cause a cycle.


I was trying to log into my Yahoo Mail today and received this message

"Your request is prohibited because it would cause a cycle."

The link I was using was to the Old Yahoo Mail site, so the thought was they've closed the link to force users to start using the New Yahoo!

Additional System Details

Sites Affected


Installed Plug-ins

  • Shockwave Flash 11.4 r402
  • Adobe PDF Plug-In For Firefox and Netscape 10.1.4
  • iTunes Detector Plug-in
  • Adobe PDF Plug-In For Firefox and Netscape 10.1.2
  • Windows Presentation Foundation (WPF) plug-in for Mozilla browsers
  • DRM Netscape Network Object
  • Npdsplay dll
  • DRM Store Netscape Plugin


  • User Agent: Mozilla/5.0 (Windows NT 5.1; rv:17.0) Gecko/17.0 Firefox/17.0

More Information

After some changers were made to the original link I think I've solved the problem
Please try the new link here and see if it helps you?

Helpful Reply

I changed the old mail link to this and it seems to work. Give it a try and see how you go.

Remember to sign out of Yahoo Mail first as I'm not sure if it will work until you do?


  • Top 10 Contributor
  • Moderator
10753 solutions 96760 answers

Note that using a specific URL that includes GET data or uses a specific domain like mg5.mail.yahoo to access a specific page can stop working at any time there are changes made to a web page, so it is best to avoid bookmarking such pages and use a button on the main page or the log in page.