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List:       centos
Subject:    Re: [CentOS] New mail server slow connecting to web server
From:       Gordon Messmer <gordon.messmer () gmail ! com>
Date:       2018-05-25 16:13:44
Message-ID: 3a1fb96f-b100-30c9-2956-4ea0aa300cda () gmail ! com
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On 05/24/2018 09:10 PM, Gary Stainburn wrote:
> name resolution isn't the problem as I can nslookup both ways without
> problems


Can you provide more detail here regarding what tests you performed?  
Long delays are usually a timeout on a reverse DNS lookup (that is, a 
PTR lookup) on the connecting IP address.

Connect to the server, and get the address that the server sees as its 
peer either from the log or using "ss -o state established -t".  Use 
"time host $ip" to test the reverse lookup.  Send the output to the list.

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