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NotionCommotion

Can't resolve IP and unknown name/service

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On the bottom, [Warning] IP address '209.126.136.5' could not be resolved: Name or service not known is displayed.

 

https://www.abuseipdb.com/whois/209.126.136.5 shows the following:

  • ISP QuadMetrics
  • Usage Type Data Center/Web Hosting/Transit
  • Domain Name cari.net
  • Country United States
  • City San Diego, California

My server is hosted by 1&1.

 

I can find no relationship between 1&1, QuadMetrics, and cari.net.

 

Why might MariaDB display this warning and this specific IP?

[michael@devserver ~]$ sudo systemctl status mysqld
● mariadb.service - MariaDB database server
   Loaded: loaded (/usr/lib/systemd/system/mariadb.service; enabled; vendor preset: disabled)
  Drop-In: /etc/systemd/system/mariadb.service.d
           └─migrated-from-my.cnf-settings.conf
   Active: active (running) since Sat 2017-09-09 14:50:22 UTC; 2h 5min ago
  Process: 55415 ExecStartPost=/bin/sh -c systemctl unset-environment _WSREP_START_POSITION (code=exited, status=0/SUCCESS)
  Process: 55371 ExecStartPre=/bin/sh -c [ ! -e /usr/bin/galera_recovery ] && VAR= ||   VAR=`/usr/bin/galera_recovery`; [ $? -eq 0 ]   && systemctl set-environment _WSREP_START_POSITION=$VAR || exit 1 (code=exited, status=0/SUCCESS)
  Process: 55369 ExecStartPre=/bin/sh -c systemctl unset-environment _WSREP_START_POSITION (code=exited, status=0/SUCCESS)
 Main PID: 55383 (mysqld)
   Status: "Taking your SQL requests now..."
   CGroup: /system.slice/mariadb.service
           └─55383 /usr/sbin/mysqld


Sep 09 14:50:22 myip.com mysqld[55383]: 2017-09-09 14:50:22 140611860559616 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
Sep 09 14:50:22 myip.com mysqld[55383]: 2017-09-09 14:50:22 140613201893504 [Note] Plugin 'FEEDBACK' is disabled.
Sep 09 14:50:22 myip.com mysqld[55383]: 2017-09-09 14:50:22 140613201893504 [Note] Server socket created on IP: '::'.
Sep 09 14:50:22 myip.com mysqld[55383]: 2017-09-09 14:50:22 140613201893504 [Note] Reading of all Master_info entries succeded
Sep 09 14:50:22 myip.com mysqld[55383]: 2017-09-09 14:50:22 140613201893504 [Note] Added new Master_info '' to hash table
Sep 09 14:50:22 myip.com mysqld[55383]: 2017-09-09 14:50:22 140613201893504 [Note] /usr/sbin/mysqld: ready for connections.
Sep 09 14:50:22 myip.com mysqld[55383]: Version: '10.2.7-MariaDB'  socket: '/var/lib/mysql/mysql.sock'  port: 3306  MariaDB Server
Sep 09 14:50:22 myip.com systemd[1]: Started MariaDB database server.
Sep 09 14:50:22 myip.com mysqld[55383]: 2017-09-09 14:50:22 140611860559616 [Note] InnoDB: Buffer pool(s) load completed at 170909 14:50:22
Sep 09 15:44:06 myip.com mysqld[55383]: 2017-09-09 15:44:06 140613072492288 [Warning] IP address '209.126.136.5' could not be resolved: Name or service not known
[michael@devserver ~]$

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Is port 3306 open to the world? Maybe someone tried to connect.

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Is port 3306 open to the world? Maybe someone tried to connect.

Yeah it was.  Since closed.  Before closing, I restarted mysql and it was still connected.  Would that make any sense?

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Yeah it was.  Since closed.  Before closing, I restarted mysql and it was still connected.  Would that make any sense?
^
What?
If you're talking about the message in the log, well yeah that's not going to disappear. What matters is whether any more of them appear.

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