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Editorial Team
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Asked: 2026-05-30T22:52:35+00:00

Examples of the strange URL(s) that we get when this occurs: (note the long

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Examples of the strange URL(s) that we get when this occurs: (note the long string before the /controller/ part)

http://domain.com/(F(RJ98SBleKwJwzM59cfA_Kr5pxNDeLW07xV65XfHzSqeZlZcgvl1TwHeH_s4rlWWPRo3dV9KGDati6kVlQ3o--KnVANIpqwvOB_H8cBO7MhPLXO2MIHITYUKnLp3DzKPwiQUOwaHa8fQpuXsbz1NIiuRICY4CaEBYhQ1qwkX64plaqhCGk6CG7Gk7WFB_Njq-XTtGDXLvcenSBZvMJ22Fgw2))/controller1/action1

http://domain.com/(F(ZbnIOH70BxAn2Eo6zzdH9zVWu4Oa7DrMaRk_tF41F3WcRapNeXghfDY0_f-2uYbPkWv1UV1ZyPp3tBPSM0I-UDbIyU2O_MKWPVcSg4D3uRo5kA6kRu7niobbJuPL5F8Gkc2g_a6mVhp_JGIRR4i1SRhyh8ovneMFzXHCGWU75TJogqlkjj5XTZNhG_LgqXHOy51Z92ueXjpLQdGh7b4kg_iixNPEn8qJHm_fudm-R8U1))/controller2/action2

I’m actually having trouble reproducing it since there doesn’t seem to be a clear pattern on how it occurs. It occurs randomly for different controllers/actions and these actions can/may have different authorization attributes (we’re authorizing based on Roles with ASP.NET Membership). I’m starting to think it’s client-related, though, as when the user reports the issue, I’m able to log onto that same account and access those pages without an issue.

Symptoms:

  1. once logged out, user can’t log back in
  2. strange url shown when attempting to log back in

Things that seem to fix it (from the user):

  1. clearing browser cache AND restarting Safari
  2. rebooting

Does anyone have a lead as to why that strange URL is being generated? Thanks in advance!

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1 Answer

  1. Editorial Team

    It’s due to the cookieless feature in .net. So it’s the forms authentication in the URL. Have a look at this question:

    IIS7.5 ASP.NET MVC users hitting strange URLs: /(F(1xe9eXIxPz

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