1 Try another availability checker, for example, http://uptime.onl 2 All errors should be in the server logs. So to be certain what is the errors cause better to check logs at first. Source: almost 3 years ago

1 If the service is an API or a website URL, you can use tools like https://uptime.onl to check if it works. Source: almost 3 years ago

After fix, I would recommend to monitor your website with a tool like https://uptime.onl/. Source: about 3 years ago

You can use services like uptime.onl or uptimerobot.com to do checks automatically. Source: about 3 years ago

Suddenly I started to receive "Connect timeout" errors for this blog from my website availability monitoring tool. - Source: dev.to / about 3 years ago

You can check the DNS with whatismydns.net and intodns.com. Source: about 1 year ago

Feel free to check https://intodns.com/ and https://www.whatsmydns.net/ to monitor propagation and ensure the DNS records are correctly set. Source: about 1 year ago

Just in case, it would be a good idea to check the DNS with a tool like intodns.com, just to make sure everything is working as intended. Source: over 1 year ago

I know this is a little old but I came across some of my tools I used when going through bookmarks: - https://mail-tester.com Although I already mentioned this above, this has been a lifesaver when it comes to figuring out why 3rd parties are rejecting your mail - https://intodns.com Helps give you a more thorough view into how your DNS settings are configured. - https://mailu.io Not a diagnostic tool, but a... Source: over 1 year ago

If you need external confirmation of things, intodns.com and dnschecker.org are both pretty good. Source: over 1 year ago