Bug 55935 - Sendmail identd timeout causes hangs when connecting to send mail
Sendmail identd timeout causes hangs when connecting to send mail
Product: Red Hat Linux
Classification: Retired
Component: sendmail (Show other bugs)
All Linux
medium Severity low
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Assigned To: Florian La Roche
David Lawrence
Depends On:
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Reported: 2001-11-08 22:11 EST by Mike McHenry
Modified: 2007-04-18 12:38 EDT (History)
0 users

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Doc Type: Bug Fix
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Last Closed: 2001-11-08 22:11:58 EST
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Description Mike McHenry 2001-11-08 22:11:54 EST
From Bugzilla Helper:
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)

Description of problem:
The sendmail.cf config defaults to a 5 second timeout on identd lookups. 
What this means is that anyone connecting to a Redhat mail server and not 
running identd (most Windows clients) will experience a 5 second delay 
while the Redhat box times out on the identd time.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. Telnet to port 25 on Redhat server running sendmail from a client 
without an identd server (Windows)

Actual Results:  Five second hang will be experienced before getting 
sendmail prompt.

Additional info:

I would recommend changing the default identd timeout in sendmail.cf to 0s 
or something lower than 5 seconds. This can be changed directly in the 
sendmail.mc used to build the cf file...

#O Timeout.ident=5s

should be something like

O Timeout.ident=0s
Comment 1 Florian La Roche 2001-12-08 04:00:43 EST
Why are no rejects done from Windows? Looks like a bad firewall configuration
that could be the cause for this?

I agree that identd is not very useful, but will probably leave the default
settings for now.

Florian La Roche

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