SChannel Errors with Outlook 2013 when May 2015 Critical Updates performed. Channel Error is 808 and seems undocumented.

Can anyone help. I updated the May Critical updates on 15th May 2015 and then Outlook Stops, and in the Event Viewer for SChannel I get the following

A fatal alert was generated and sent to the remote endpoint. This may result in termination of the connection. The TLS protocol defined fatal error code is 40. The Windows SChannel error state is 808.

I've no idea what 808 is, but the 40 is a handshake error.

Now if I go back to my restorepoint prior to the updates it all works again, until the system does the updates again (all 15 of them). It appears to be something in the updates, but cannot find other people complaining about this. It's also a bit disappointing that the error state of 808 seems to be undocumented.

Can anyone help?

I have since diagnosed which Patch it is with the problem. It's KB3061518 (MS15-55). Doesn't help much since bing/google aren't telling me about reports of problems with it (apart from a CAD package) running Outlook email workload.



  • Edited by Marked10 Wednesday, May 20, 2015 6:30 PM
May 20th, 2015 4:56pm

Hi Kate,

Thank You for this answer. It worked completely on my install. The only difference to your commentary was I also had to add the Diffie-Hellman key.

So I will let me email provider know, in order they can think about updating their server to 1024bit.

Many thanks for your prompt response

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May 22nd, 2015 4:02pm

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