Category Archives: IIS

Error 0x80070520 “A specified logon session does not exist” when binding a certifate in IIS 7

I had a problem when using a certificate ( for ADFS) on IIS 7. This certificate once been used on IIS 6 and TMG 2010 server and it works fine. This means there is no problem with the certificate itself.

To reproduce the steps :

  • Open the IIS MMC
  • open the Site Bindings
  • add a HTTPS binding
  • Select this certificate from the certificates drop down list, and click OK. Then you get the follow error:

A specified logon session does not exist. It may already have been terminated.

(Exception from HRESULT: 0x80070520)

In my case, the solution is :

  • remove the certificate from IIS
  • Import the certificate using the Certificates MMC snap-in
  • Choose the correct certificate in IIS manager


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