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emailiissmtplocalhosttelnet
Lars Holdgaard
Lars Holdgaard

Reputation: 9986

Port 25 / 26 says "Could not open connection" using Telnet

I am currently troubleshooting an email problem with my server (IIS 7,5 , Windows server 2008 R2). When I run the "Telnet" command, I get the "Connecting to 127.0.0.1... Could not open the connection to the host, on port 25".

I've been running the commands:

All of these return the same message. If I run at port 80, I get a response.

I tried to turn off my firewall, which made no changes to the behavior (still could not open...).

Is this the usual behavior? Should sending emails still work, or are there something wrong?

Upvotes: 1

Views: 8099

Answers (1)

Brian White
Brian White

Reputation: 8756

Port 25 is for an MTA (message transfer agent) which passes email along as it goes from sender to recipient. If you don't have one installed and running locally then there is nothing listening on that local port. That sounds like the case.

Sending email is an outgoing connection (using some random local port) that can be done by connecting to an MTA on any machine accessible via the network; it doesn't have to use one on the local machine.

Upvotes: 1

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