Hello, I have a DirectAccess 2012 R2 server that has a RapidSSL cert for the IPHTTPS certificate. When that server reboots or when the server is up for a while, it looses the binding for the external IP and SSL cert in IIS, breaking DirectAccess. I have seen the binding directly after reboot using "netsh http show sslcert" but then the same command showed it gone a few moments later. Also of note, I see the SSL cert binding being deleted but not re-created in the event log. You see Event ID 15300 in the System log removing the bindings and then 15301 event ids re-creating the entries, all except the one I need to work. This issue is pretty much the same as the issue listed here: https://support.microsoft.com/en-us/kb/2025598/. However, IIS 8.5 does not have the settings mentioned, as far as I can see.
Adam