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How to know port is block..

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Special Forums IP Networking How to know port is block..
# 1  
Old 05-05-2008
How to know port is block..
My server is running on a port 16386, in the case when this port is blocked by some other application ( anti virus etc. ) or firewall then how do i know it's block? Is bind will return any specific error in this case.
I have to know is it blocked or not?
# 2  
Old 05-06-2008
Blocks don't typically prevent you from binding to a port, it just prevents any clients from connecting to that port successfully. Run a quick client check to that port and see if it succeeds? Try localhost and the external IP address.
# 3  
Old 05-15-2008
The obvious way is that connect() will always timeout on filtered ports while you'll get connection refused from unbound service ports.
Of course, that's too obvious, but is a start. Take a look at the code for something like nmap for heuristics.
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