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This chapter gives an idea of the ports and protocols that Nagios comprises.

Protocols

The default protocols used by Nagios are as given under −

• http(s), ports 80 and 443 − The product interfaces are web-based in Nagios. Nagios agents can use http to move data.
• snmp, ports 161 and 162 − snmp is an important part of network monitoring. Port 161 is used to send requests to nodes and post 162 is used to receive results.
• ssh, port 22 − Nagios is built to run natively on CentOS or RHEL Linux. Administrator can login into Nagios through SSH whenever they feel to do so and perform checks.

Ports

The Default ports used by common Nagios Plugins are as given under −

• Butcheck_nt (nsclient++) 12489
• NRPE 5666
• NSCA 5667
• NCPA 5693
• MSSQL 1433
• MySQL 3306
• PostgreSQL 5432
• MongoDB 27017, 27018
• OracleDB 1521
• Email (SMTP) 25, 465, 587
• WMI 135, 445 / additionaldynamically-assigned ports in 1024-1034 range

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