I apologize but I was wrong and we cannot call it a bug.
Turned out the FW was interfering with traffic. Everything is okay now.
Thanks a lot

On Fri, May 14, 2021 at 1:40 AM Alex Murray <email address hidden>
wrote:

> Thanks for taking the time to report this bug and helping to make Ubuntu
> better. We appreciate the difficulties you are facing, but this appears
> to be a "regular" (non-security) bug.  I have unmarked it as a security
> issue since this bug does not show evidence of allowing attackers to
> cross privilege boundaries nor directly cause loss of data/privacy.
> Please feel free to report any other bugs you may find.
>
> ** Information type changed from Private Security to Public
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1928216
>
> Title:
>   Error: (ERR_get_error_line_data = 336130329), Could not complete SSL
>   handshake with X.X.X.X: decryption failed or bad record mac
>
> Status in nagios-nrpe package in Ubuntu:
>   New
>
> Bug description:
>   Hello, I have odd behavior on one of my Ubuntu servers after updating
> Nagios server to Ubuntu 18.04.
>   That is the only server that has the issue and this server is in a
> different time zone also its server communicates with the Nagios server
> through a tunnel.
>
>
>   May 12 17:10:29 svn-blr nrpe[4190]: Listening for connections on port
> 5666
>   May 12 17:10:29 svn-blr nrpe[4190]: Allowing connections from:
> 127.0.0.1,10.100.0.199,nagios.welldocinc.com
>   May 12 17:10:42 svn-blr nrpe[4204]: CONN_CHECK_PEER: checking if host is
> allowed: 10.100.0.199 port 60596
>   May 12 17:10:42 svn-blr nrpe[4204]: Connection from 10.100.0.199 port
> 60596
>   May 12 17:10:42 svn-blr nrpe[4204]: is_an_allowed_host (AF_INET): is
> host >10.100.0.199< an allowed host >10.100.0.199<
>   May 12 17:10:42 svn-blr nrpe[4204]: is_an_allowed_host (AF_INET): is
> host >10.100.0.199< an allowed host >10.100.0.199<
>   May 12 17:10:42 svn-blr nrpe[4204]: is_an_allowed_host (AF_INET): host
> is in allowed host list!
>   May 12 17:10:42 svn-blr nrpe[4204]: Host address is in allowed_hosts
>   May 12 17:10:43 svn-blr nrpe[4204]: Error: (ERR_get_error_line_data =
> 336130329), Could not complete SSL handshake with 10.100.0.199:
> decryption failed or bad record mac
>   May 12 17:10:43 svn-blr nrpe[4204]: Connection from 10.100.0.199 closed.
>   rgataullin@svn-blr:~$  decryption failed or bad record macError:
> (ERR_get_error_line_data = 336130329), Could not complete SSL handshake
> with 10.100.0.199: decryption failed or bad record mac
>
>   Wed May 12 17:48:53 IST 2021
>
> To manage notifications about this bug go to:
>
> https://bugs.launchpad.net/ubuntu/+source/nagios-nrpe/+bug/1928216/+subscriptions
>

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