Bug 55935

Summary:	Sendmail identd timeout causes hangs when connecting to send mail
Product:	[Retired] Red Hat Linux	Reporter:	Mike McHenry <mmchenry>
Component:	sendmail	Assignee:	Florian La Roche <laroche>
Status:	CLOSED NOTABUG	QA Contact:	David Lawrence <dkl>
Severity:	low	Docs Contact:
Priority:	medium
Version:	7.2
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	Bug Fix
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Clone Of:		Environment:
Last Closed:	2001-11-09 03:11:58 UTC	Type:	---
Regression:	---	Mount Type:	---
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Embargoed:

Description Mike McHenry 2001-11-09 03:11:54 UTC

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:
Always

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 09:00:43 UTC

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