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

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 12 hours 55 minutes ago

Hi,

After you install this security update, the minimum allowed DHE key length on client computers is changed to 1,024 bits by default, instead of the previous minimum allowed key length of 512 bits.

Please check if the issue can be resolved after revert to using a 512-bit key length.

To edit this registry entry, follow these steps:

1. Click Start, click Run, type regedit in the Open box, and then click OK.

2. Locate and then click the following subkey in the registry:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\KeyExchangeAlgorithms\Diffie-Hellman

3. On the Edit menu, point to New, and then click DWORD Value.

4. Type ClientMinKeyBitLength for the name of the DWORD, and then press Enter.

5. Right-click ClientMinKeyBitLength, and then click Modify.

6. In the Value data box, type 00000200, and then click OK.

Exit Registry Editor, and then restart the computer.

Can we fix this issue?