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Mango-Man

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Intermittent Port 443 (SSL) on SBS Server 2011

Hi all,

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.

Any ideas?

Bob
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Chris H
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Mango-Man

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Only from the WAN side - internally is fine.  I'm thinking it may be a problem with the ISP, upstream even from the ADSL modem.
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Hi David,

Yep agree but we've replaced the router (they are using their ADSL modem - yes I know, we've tried getting them on a Fortinet).  This same arrangement works for other customers and the modem has been replaced with a different model.  We've checked and re-created the virtual servers over and over.  As per the attachment, the process ID is 4 which is 'SYSTEM' which isn't particularly helpful!
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Apologies all for the tardy response - I completely forgot about this.  So we replaced the modem again and voila, problem solved.

3 ADSL modems and only one worked - what are the chances?