openning a port

have a database that uses a login web client on a SBS2012
I open the port in the firewall for this web client and also made a passthrough on our Linksys router
the port is 245
we also have a passthrought to the SBS server for port 443, this works fine
we also have a passthrough to a NVR ( on port 8100, this works fine

my problem is port 245
if I use port 245 is not responding and all the other ports are open and test fine

We use a Comcast ISP, they do have a router here as well but this router is in bridge mode, I called Comcast support and they tell me our linksys is in charge of routing and that their router is in modem mode
I also called Linksys support and they double checked my passthroughs and say things are configured correctly but port 245 is not responding.

Could it be the web client is not working so the test I'm doing at is responding with "I cannot see port 245?"
jsarinanaI.T. ManagerAsked:
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QlemoConnect With a Mentor DeveloperCommented:
Just use the web client as you would, but with the internal (and effective) address and port 245. It should work as you expect it to work from Internet.
nader alkahtaniNetwork EngineerCommented:
Use wireshark then filter dst and src IP  , port 245
nader alkahtaniNetwork EngineerCommented:
Scan from out side about 245 port
If open , search about the problem in another side
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Of course you tried to reach port 245 internally first, and checked the web server receives traffic on that port?
jsarinanaI.T. ManagerAuthor Commented:
what would I go about scanning port 245 internally? and also check traffic on the web server?
jsarinanaI.T. ManagerAuthor Commented:
thanks web client is not responding, I'll call support on Monday
jsarinanaI.T. ManagerAuthor Commented:
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