Total Server Monitor will monitor your server availability. You can rely on it.
Use it to automatically monitor all aspects of your server and network. It will inform you in case of a failure (i.e. machine not responding to HTTP, POP3, FTP). Total Server Monitor will also correct the problem (restart service or machine, send an email to you or execute http url or external program). You will be the first to know about the problem and have the chance to fix it before everything gets worse. Download your copy of Total Server Monitor now for free and see that it works well indeed.