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Old 08-30-2006, 04:27 PM   #1
caykroyd
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anyway to check if ISP is blocking ports


I think my ISP may be blocking port 25. Is there anyway to confirm this, without asking them? I'm afraid if I ask and they are not blocking, they may start blocking it.
 
Old 08-30-2006, 05:26 PM   #2
acid_kewpie
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you can see what somethign like Sheilds Up! says about your IP, but it depends what equipment you have, if you can put a machine in a dmz, or just portforward 25 from a router then you can tcpdump on the machine and see if you see any inbound packets on that port
 
Old 08-30-2006, 07:56 PM   #3
blankbmx
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yes, you can also set up smtp on a local machine, and telnet localhost 25. if that works, but you cannot telnet to port 25 on that box from a remote ip, then chances are your isp is blocking that port.
 
  


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