SMTP timeout from server a to server b. telnet <serverb> 26 works, but not port 25

ttremain

• June 20, 2020 05:32

SMTP timeout from server a to server b. telnet 26 works, but port 25 times out. traceroute -p 25 works just fine. APF firewall and cphulk both disabled on both servers to run tests. I'm unsure what else to look at Please advise

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  GOT

  • June 20, 2020 10:35

  Are you testing as root or a cPanel user?

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  ttremain

  • June 20, 2020 10:58

  Are you testing as root or a cPanel user?

  
  As root

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  GOT

  • June 20, 2020 11:43

  Well first step is to determine which server the issue is on. So try telneting to server b from a different server. This will tell you is the hang up is on server a or server b.

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  ttremain

  • June 20, 2020 21:15

  Well first step is to determine which server the issue is on. So try telneting to server b from a different server. This will tell you is the hang up is on server a or server b.

  
  Not sure why I didn't think of that test. So a third server can telnet to server b, port 25, just fine. Anyway, figured it out, and the datacenter blocked outbound port 25 on new devices via hardware

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  GOT

  • June 20, 2020 22:15

  Yeah seen that before...

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  cPanelLauren

  • June 23, 2020 23:56

  This happens pretty frequently. If you have access to the server where it's blocked you can have Exim listen on port 26 at WHM>>Service Configuration>>Service Manager

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