Statuscake.com if you just need a simple up/down monitor. - Source: Reddit / 10 months ago
I've had a great time with statuscake.com for my personal and friends sites. They've even improved custom status pages to include an automatically signed certificate too, so you can make a site like status.yourdomain.com... Test TCP connection, specific HTTP/HTTPS query etc. 5 minute intervals for free, more with paid plans. - Source: Reddit / about 1 year ago
I use statuscake.com for external stuff and nagios for internal. PRTG is good too. - Source: Reddit / about 1 year ago
I use statuscake.com for all my personal / friend sites. There seems to be no limit to number of sites to monitor for basic 5 minute intervals in the free account. - Source: Reddit / over 1 year ago
I use noip.com for a free domain name and a free plan on statuscake.com for this setup. - Source: Reddit / over 1 year ago
Statuscake.com can be used for TCP connections, so that should work. - Source: Reddit / almost 2 years ago
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