Webservers: Port 80 (HTTP Sensor), Ping
-You can use SNMP to get processor load, memory usage, network card usage, disk free, etc. I would specifically look at memory if you are hosting a shared server and also hard drive. Some monitoring programs allow you to monitor a specific folder. Those two sensors would be great for shared web server.
Mail: SMTP, POP, IMAP, Round Trip
We also monitor these services from various probes to detect potential issues from other areas around the world.
-Chris
Sys Admin
OnlineTech.com
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