Can't connect to host via ftp, but why?

Question

FTP

Since yesterday, on my home Internet, I cannot connect via ftp to a certain server, I tried others, everything connects. Not at all, I tried it from different programs, demolished the router to the factory settings, rebooted everything naturally. Not in any, from all devices in the grid. Everything works with vpn. I wrote to the hosting support, they said that "difficulties on the route of the packets", but why is it only with them that this is a problem? Never had a problem with ftp...

Answer 1

Possibly limited access from your region

Answer 2

Your ISP (or upstream) has restricted access to this IP address
Your router has nothing to do with it

Answer 3

After some time, the problem disappeared and began to connect, and the problem remained a secret ...