I recently had reason to query whether XNet was blocking port 445 (they were) and in the course of answering my question XNet sent me the following comprehensive list of all ports blocked. I thought it might be useful for reference purposes :) It is not possible to unblock ports on a per-user basis (with the exception of port 25 - see below). BTW, I emailed them today (sat avo) and got a reply within 30min! 10 points for XNet service!!
Yes, 445 is blocked for security reasons.
The following ports are blocked on the Xnet Network TCP/UDP. A static
route can be added via www.xnet.co.nz/staticip to remove the port 25 block.
None of the other ports will be unblocked as they are blocked due to
security holes and possible exploitation.
tcp any any eq 25
tcp any any eq 135
udp any any eq 135
tcp any any eq 137
udp any any eq 137
tcp any any eq 139
udp any any eq 139
tcp any any eq 445
tcp any any eq 593
tcp any any eq 4444
tcp any any eq 3997
tcp any any eq 2745
I apologise for any inconvenience this may cause, however we need to
consider the security of the network for our customers.
Technical Response Representative
WorldxChange Communications Ltd
0800 14 9638