Please note that these are problems which players tend to have. I'm creating this topic so I can send them this topic, rather than explaining it every time.
Problem: So that problem in MG server. They can see every server on the SAMP list, but not MG. It looks like it's offline, but it's not.
Solution: This happens from time to time, oftenly because you get caught up in the firewall or something similar. You don't have to worry about it. If it happens over a long period, try restarting your router. If it still happens after that, and you've waited a couple of days; PM me about that for more info if you want.
EDIT; if you have more solutions, write them down here