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Uhm, i guess we're talking about a business environment.<br />
If it's properly designed then the sysadmins are the ones who can block a port (and all persons who have access to the firewall :))
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I think you need to be a bit more specific. Like port number and stuff.
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What ports # do i have to open to make a vpn in server 2008 with one nic?
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I need to know who is blocking a port in my network? what software can tell me who is blocking the port.
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I need to know who is blocking a port in my network? what software can tell me who is blocking the port.

who is blocking a port

Software firewalls, also known as host-based firewalls, provide a layer of software on one host that controls network traffic in and out of that single machine. Most operating systems now include firewall software, but many available software firewalls include central distribution, antivirus systems and disaster recovery.