So I've been confounded by a weird problem a client of mine is having. They have an ADSL connection with a static IP address, a proper SSL certificate (assigned by a trusted authority) and are running SBS 2011.
The firewall has ports 80 and 443 forwarded.
Outlook Web Access and ActiveSync access keep dropping.
We investigated and found port 443 seems to be unavailable about 50% of the time, despite port 80 being available 99% of the time.
Telnet shows the same thing.
We've replaced the modem, the switch, disabled Sharepoint, etc. - anything we though might be interfering with 443 but no dice.
Today I installed CurrPorts to see what is listening on port 443 and found two entries but neither tell me what the process is - is this normal?
I also created a port forwarding entry in the firewall that went from 1443 externally to 443 internally - telnet on this works every time, although trying https://servername.domain.com:1443 timed out.
I've attached the currports finding as what concerned me was the lack of info of any kind about the process listening.