Can't send email behind router

A client of mine has a network with 4 computers on it. Their ISP is Bresnan Communications (http://www.bresnan.net).

Here a sequence of events that happened a few months ago:

- Everything working fine

- Randomly, one day no computers on the network could send email using Outlook Express with and error that said, "The connection to the server has failed." The error number is 0x800ccc0E. The following command fails when typed of the cmd prompt: telnet mail.bresnan.net 25. All other Internet functions worked great.

- Any computer could send email when connected directly to the cable modem.

- I made them replace the router with a Linksys WRT54GS With SpeedBooster. Presto! Problem resolved.

- Everything working fine for several months.

- Last week, randomly no computers on the network can send email using Outlook Express with the same error as before. Any computer can send email when connected directly to the cable modem.

- I also have Bresnan as my ISP. I have a DLink router and can send email and typing telnet mail.bresnan.net 25 works like a charm at my house.

I upgraded the firmware and disabled the router's firewall. My main test machine on the network has no software firewalls installed. Bresnan said since it works fine when I connect directly to the modem that it is Linksys' problem. Linksys was very polite but not very helpful; they tried adding port triggering and forwarding settings that I didn't have to have before and wanted to place the computer in the DMZ. This is not useful when multiple computers need to send email....

Any ideas ?

My ISP autheticates all email based on username. I can't send email from any other username than dglienna, which is the one that they know of. They may block port 25, but that isn't for direct email from a client. Call them up and ask them. Maybe they don't want multiple accounts. When you telnet in, it has your authentication, I think.

Have you tried not connecting to port 25? (Omit the port number at the end of the connecting address)

port 25 is also the SMTP port (I think) if you are connecting to LMAP (or whatever) you may need to open a different port.

Bresnan recommends that you change your outgoing mail settings (SMTP) to mail.bresnan.net.

See http://www.bresnan.com/~support/hsd/SpamUpdate.asp

Quote:

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Originally Posted by Allen Schoessler

A client of mine has a network with 4 computers on it. Their ISP is Bresnan Communications (http://www.bresnan.net).

Here a sequence of events that happened a few months ago:

- Everything working fine

- Randomly, one day no computers on the network could send email using Outlook Express with and error that said, "The connection to the server has failed." The error number is 0x800ccc0E. The following command fails when typed of the cmd prompt: telnet mail.bresnan.net 25. All other Internet functions worked great.

- Any computer could send email when connected directly to the cable modem.

- I made them replace the router with a Linksys WRT54GS With SpeedBooster. Presto! Problem resolved.

- Everything working fine for several months.

- Last week, randomly no computers on the network can send email using Outlook Express with the same error as before. Any computer can send email when connected directly to the cable modem.

- I also have Bresnan as my ISP. I have a DLink router and can send email and typing telnet mail.bresnan.net 25 works like a charm at my house.

I upgraded the firmware and disabled the router's firewall. My main test machine on the network has no software firewalls installed. Bresnan said since it works fine when I connect directly to the modem that it is Linksys' problem. Linksys was very polite but not very helpful; they tried adding port triggering and forwarding settings that I didn't have to have before and wanted to place the computer in the DMZ. This is not useful when multiple computers need to send email....

Any ideas ?

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What type of error do you get when you attempt to use telnet to connect ot the server? Timeout, connection refused, invalid host?

So what did you figure out all those years ago. It is 2010 almost 2011 and this is happening to me.
Mac Mail Version 2.1.3 (753.1), New Bresnan router, wireless network with 4 computers.
Mail will come in, mail will not go out.

It's general policy to start a new thread rather than bumping ancient ones. (as you are aware it's been dead for five years) And to not hijack other people's threads (not post your own questions in threads started by other members). Instead create a new thread when you have a question, and post a link if you have a related thread.