Windows Update MS16-072 Breaks Meeting Place

[John Early]

I am sure everyone is aware of the Group Policy issues with MS16-072.  I have a different problem.  All of my GPOs are working fine BUT my internal weak SHA1 SSL sites are not working.  These are primarily for things my IT team uses but our Cisco Meeting Place server is the only user facing one that has issues.  The sites all break through Internet Explorer ONLY, they work in Chrome and Firefox.  Has anyone run into this as well and could point me in the right direction to resolve it??  

Thanks

[dpetrovi]

Hi John,

Please, let us know of more details about your MeetingPlace solution and when the issue is presented exactly.

1. What version of MeetingPlace do you have installed?
2. Is it audio only deployment?
3. What part of MeetingPlace your end users are accessing? (MPWeb interface?)
4. Have you installed any Windows update to MP Web server using standard Windows Update, or you used an official Cisco Windows OS update package?

Thank you.

-Dejan

[John Early]

Turns out adding this registry key worked.....

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\KeyExchangeAlgorithms\Diffie-Hellman]
"ClientMinKeyBitLength"=dword:00000200