Use these sites to test whether a service is up from other locations:
- https://testlocal.ly
- https://www.locasnap.com
- https://www.uptrends.com/tools/uptime
- https://www.site24x7.com/check-website-availability.html
And use these sites to ping/mtr from other locations (keeping in mind, of course, that some hosts block ping/mtr replies even when working normally):