Re: Different postfix connection results from desktop and laptop on same network using telnet

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On Sat, 2025-09-13 at 13:35 -0500, Ranjan Maitra via users wrote:
> I noticed that my postfix has an issue with my laptop since the
> middle of this week. Specifically, the connection to the mailserver
> times out. However, this connection goes through and gets delivered
> from my workstation.  Both of them are fully updated with Fedora 42
> (workstation/desktop and a laptop). The main difference between them
> is that the laptop is connected to the  network by means of WiFi and
> the other is connected by means of ethernet (on to the same
> university network).
> 
> I was trying to see what the problem was and I tried:
> 
> telnet mailserver portnumber
> 
> on both machines.
> 
> In the case of the laptop, I get:
> 
>  Trying IP address...
> 
> (hangs)
> 
> while in the case of the desktop, I get:
> 
>  Trying (same) IP address...
>  Connected to mailserver 
>  Escape character is '^]'.
>  220 out-?.mail.domainname ESMTP Postfix (Ubuntu)
> 
> What could the problem be?

Is the Wi-Fi router something that you can reboot?  They do stuff up
from time to time.

-- 
 
uname -rsvp
Linux 3.10.0-1160.119.1.el7.x86_64 #1 SMP Tue Jun 4 14:43:51 UTC 2024 x86_64
(yes, this is the output from uname for this PC when I posted)
 
Boilerplate:  All unexpected mail to my mailbox is automatically deleted.
I will only get to see the messages that are posted to the mailing list.
 

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