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[EP-tech] ePrints server is freezing very often

Hi Everyone, In the recent past, our eprints server,
eprints.iisc.ac.in, in becoming unresponsive very frequently - i would
say, once every 30 minutes. Restarting the httpd server brings back
the server, but in less than 30 minutes it freezes again! I had a look
at the httpd error log file, and was surprised to see that the log
file is full of entries similar to the ones indicated below:

[Fri Apr 05 22:44:43.717856 2019] [:error] [pid 114613] :Apache2 IO
write: (32) Broken pipe at /opt/eprints3/cgi/exportview line 108
[Fri Apr 05 22:44:52.392811 2019] [:error] [pid 114910] :Apache2 IO
write: (32) Broken pipe at /opt/eprints3/cgi/exportview line 108
[Fri Apr 05 22:44:58.314788 2019] [:error] [pid 114919] :Apache2 IO
write: (32) Broken pipe at /opt/eprints3/cgi/exportview line 108

I also had a look at the Mariadb log file, which is bombarded with
entries indicated below:

190405 23:23:59 [Warning] IP address '104.236.158.58' could not be
resolved: Name or service not known
190405 23:24:54 [Warning] IP address '104.248.56.116' could not be
resolved: Name or service not known
190405 23:25:25 [Warning] IP address '180.250.18.136' could not be
resolved: Name or service not known
190405 23:26:31 [Warning] IP address '157.230.33.59' could not be
resolved: Name or service not known
190405 23:26:59 [Warning] IP address '104.236.248.209' could not be
resolved: Name or service not known

All the IPs listed in the Mariadb log file have their origins in
China, South Korea, and other places.

Can someone help me to resolve the issue, please?.

We are running, eprints version: 3.3.15 eps on CentOS Linux release
7.4.1708 (Core)

Thanks and regards, Francis