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I am unable to open Cisco VPN Client, as it hangs and goes unresponsive in the splash screen with "Opening cert store". When opening event viewer I found a warning saying:

The application (Cisco AnyConnect VPN Client, from vendor Cisco) has the following problem: To function properly, Cisco AnyConnect VPN Client must be reinstalled after you upgrade Windows.

Any idea what could cause this?

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1 Answer 1

up vote 8 down vote accepted

I finally found out what was causing this. A single answer by Chad Roeder on the Cisco support forums had the right solution:

  1. Open Microsoft Management Console (type mmc in Run or search).
  2. Add Snap-in "Certificates" (File -> Add/Remove Snap-in... -> [find and add "Certificates] -> OK)
  3. Go to folder Personal/Certificates
  4. Remove any unwanted certificates (for me it was certificates added by Fiddler to enable SSL traffic debugging)

I hope any this helps making the solution more visible in online searches. :)

To mitigate this issue within Fiddler, either use the Fiddler CertMaker Extension (which doesn't add the certificates to your store in the first place) or use the QuickExec box below the Fiddler Web Sessions list to run the following command:

prefs set fiddler.CertMaker.CleanupServerCertsOnExit True
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Thanks for contributing. –  bigbadonk420 Jun 13 '13 at 10:50
@EricLaw Awesome addition. Other people might have issues with other applications than Fiddler, so I'll leave it with both solutions here. Yours is surely helpful to make sure Fiddler stays useful for me. :) –  Johny Skovdal Jun 13 '13 at 18:18

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