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Full Discussion: How to know port is block..
Special Forums IP Networking How to know port is block.. Post 302195551 by ramen_noodle on Thursday 15th of May 2008 10:51:24 AM
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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unbound-checkconf(8)						  unbound 1.4.17					      unbound-checkconf(8)

NAME
unbound-checkconf - Check unbound configuration file for errors. SYNOPSIS
unbound-checkconf [-h] [-o option] [cfgfile] DESCRIPTION
Unbound-checkconf checks the configuration file for the unbound(8) DNS resolver for syntax and other errors. The config file syntax is described in unbound.conf(5). The available options are: -h Show the version and commandline option help. -o option If given, after checking the config file the value of this option is printed to stdout. For "" (disabled) options an empty line is printed. cfgfile The config file to read with settings for unbound. It is checked. If omitted, the config file at the default location is checked. EXIT CODE
The unbound-checkconf program exits with status code 1 on error, 0 for a correct config file. FILES
/etc/unbound/unbound.conf unbound configuration file. SEE ALSO
unbound.conf(5), unbound(8). NLnet Labs May 24, 2012 unbound-checkconf(8)
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