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Receiving from ISP through router, Port 25
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Receiving from ISP through router, Port 25 - 26.Jun.2000 6:03:00 AM
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Guest
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I am trying to get our Exchange 5.5(SP3) to download mail from our ISP through a router. Mail goes out OK to ISP no problems. Queued mail however is not downloaded from them. The ISP says that the mail should be automatically sent as soon as a connection is established, and that we must have a problem with blocking of port 25 connections on our system. Does anyone know how I can check the status of port 25 and also how to free it up? Our ISP is Demon Internet in the UK. TIA Geraint Bowcott
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RE: Receiving from ISP through router, Port 25 - 26.Jun.2000 9:36:00 AM
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forcesho
Posts: 3
Joined: 22.Jun.2000
From: Greenwich, CT
Status: offline
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try telnet telnet yourmailserver.com 25
and if you get in, it should be no problem.
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RE: Receiving from ISP through router, Port 25 - 26.Jun.2000 9:53:00 AM
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Geraint
Posts: 4
Joined: 28.Jun.2000
From: UK
Status: offline
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quote:
Originally posted by forcesho:
try telnettelnet yourmailserver.com 25
and if you get in, it should be no problem.
I tried telnet using advice from Technet and was able to send an email to the Exchange server no problem. Technet recommended then telnetting from the ISP computer. They tried but were unable to do this suggesting the problem was with port 25 on our side.
How do I resolve this? Geraint
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RE: Receiving from ISP through router, Port 25 - 27.Jun.2000 1:07:00 PM
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marior
Posts: 4
Joined: 22.Jun.2000
Status: offline
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I had the same problem..are you using NAT if so check your configuration..I had to statically assign the server address to port 25 and 110 on the router...
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RE: Receiving from ISP through router, Port 25 - 27.Jun.2000 5:03:00 PM
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Don
Posts: 8
Joined: 27.Jun.2000
From: MA. U.S.A.
Status: offline
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Sounds like a firewalling issue. Try telneting into the Exchange server from your home machine. If you telnet into the server from a node located on the same network as the Exchange server, then you've essentially bypassed the firewall. Hope this makes sense. The firewall will probably allow outgoing mail, however, will block incoming mail. Someone also mentioned earlier that if you're using NAT (network address translation) on the router/firewall, that you may need to enable port forwarding for port 25 from the router/firewall to the Exchange server. Don
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RE: Receiving from ISP through router, Port 25 - 28.Jun.2000 4:52:00 AM
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Geraint
Posts: 4
Joined: 28.Jun.2000
From: UK
Status: offline
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Yes we are using NAT. I wondered whether this might be a prob with the router setup. I will try as you suggest.
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RE: Receiving from ISP through router, Port 25 - 28.Jun.2000 4:57:00 AM
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Geraint
Posts: 4
Joined: 28.Jun.2000
From: UK
Status: offline
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I will try telnetting in from an external computer. You say I may need to enable port forwarding for port 25 from router to exchange, but how do I actually go about doing this??? TIA Geraint
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RE: Receiving from ISP through router, Port 25 - 28.Jun.2000 7:22:00 AM
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Geraint
Posts: 4
Joined: 28.Jun.2000
From: UK
Status: offline
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Success at last! I assigned the ports to the Exchange IP in the router and we now have our mail delivered. Many thanks for your help 'marior' and Don Geraint
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RE: Receiving from ISP through router, Port 25 - 4.Apr.2001 7:10:00 PM
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Guest
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Grant,
Please share your experiences and lessons learned! I'm particularly interested in how you configured the ports between your firewall/exchange servers/clients. What ports did you open and how did you lock them down where Exchange doesn't try to open ports you never configured? Any help is truly appreciated. Can't seem to restrict the ports.. Dee VeaseyQUOTE]Originally posted by Geraint:
Success at last! I assigned the ports to the Exchange IP in the router and we now have our mail delivered. Many thanks for your help 'marior' and Don Geraint [/QUOTE]
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RE: Receiving from ISP through router, Port 25 - 4.May2001 4:56:00 PM
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TJ
Posts: 26
Joined: 4.May2001
From: Wokingham, Berkshire, UK
Status: offline
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