Pending Review
Last Updated: 01 Feb 2019 16:12 by Eric
Created on: 30 Jan 2019 21:29
Type: Bug Report
HTTPS to HTTPS Handshake To Domain Failed


I am getting the following error in fiddler and without Capture HTTPS CONNECTs it works, also in the Protocols I have enabled: <client>;ssl2;ssl3;tls1.0;tls1.1;tls1.2> HTTPS handshake to <domain> (for #6) failed. System.Security.Authentication.AuthenticationException A call to SSPI failed, see inner exception. < The message received was unexpected or badly formatted

Win32 (SChannel) Native Error Code: 0x80090326


[Edited by Telerik Staff to remove personal information and convert to bug report]

Posted on: 01 Feb 2019 16:12

You should remove both SSL2 and SSL3 from your supported protocols list, as SSL3 is not secure (and generally not used any more) and enabling SSL2 will break modern TLS versions.

Telerk should probably remove mention of SSL2 from the UI and may want to show an explicit warning if a user manually adds it.

Lance | Technical Support Engineer, Principal
Posted on: 30 Jan 2019 23:22
Hello Ashen,

Thank you for the information. I have converted the priority support ticket for UI for ASP.NET AJAX to a Fiddler Feedback Item and initially marked it as a bug report. I have also added your up-vote to the item.

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To protect your privacy I've removed the personal information that was in the original post. Note that including personal information  is not necessary for future posts as we will use the information associated with your account.

Thank you for your understanding.

Lance | Technical Support Engineer, Principal
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