We've had ActiveSync / RPC HTTPS / OWA all in place for a while. Certificates are valid for another 3+ years.
Issue started around 4 AM EST. Logs are all clean of anything related. Suspect it's our firewall (NSA 2400) but checked the config and all is the same as it has been. RPC HTTPS and OWA ultimately aren't causing any restrictions we can't workaround for our remote users but without ActiveSync working, I have a couple dozen users not getting email to their phones so it make this a bit more urgent / sensitive. I'm at a loss.
The Microsoft Connectivity Analyzer wasn't able to obtain the remote SSL certificate.
Ran an SSL check and it returns 'No SSL certificates were found. Make sure that the name resolves to the correct server and that the SSL port (default is 443) is open on your server's firewall.'
Any help figuring out what may be going on here would be greatly appreciated.