Wie du in einem anderen Thread erwähnt hast, soll der Server für dich sein.
Da rate ich dir dringendst, dass du dir eine VM zulegst und dort alles wichtige über Linux lernst!
Ein nicht abgesicherter Server kann sehr schnell zu einem Botnet gehören und dir rechtliche Probleme bereiten.
Hier mal ein
kleiner Auszug, von fehlgeschlagenen Verbindungsversuchen
2017-10-29 01:08:03,876 fail2ban.actions[485]: WARNING [ssh] Ban 13.66.53.194
2017-10-29 01:32:05,611 fail2ban.actions[485]: WARNING [ssh] Ban 58.250.250.144
2017-10-29 01:42:34,831 fail2ban.actions[485]: WARNING [ssh] Ban 153.3.88.48
2017-10-29 01:52:37,983 fail2ban.actions[485]: WARNING [ssh] Ban 181.95.57.172
2017-10-29 02:17:28,828 fail2ban.actions[485]: WARNING [ssh] Ban 181.176.179.66
2017-10-29 02:32:23,516 fail2ban.actions[485]: WARNING [ssh] Ban 201.59.41.34
2017-10-29 02:42:42,675 fail2ban.actions[485]: WARNING [ssh] Ban 60.50.252.180
2017-10-29 02:00:09,626 fail2ban.actions[485]: WARNING [ssh] Ban 171.101.240.19
2017-10-29 02:48:52,081 fail2ban.actions[485]: WARNING [ssh] Ban 218.72.34.3
2017-10-29 04:03:05,591 fail2ban.actions[485]: WARNING [ssh] Ban 101.50.3.103
2017-10-29 04:22:53,856 fail2ban.actions[485]: WARNING [ssh] Ban 82.165.36.107
2017-10-29 04:25:58,226 fail2ban.actions[485]: WARNING [ssh] Ban 116.196.97.21
2017-10-29 04:28:59,602 fail2ban.actions[485]: WARNING [ssh] Ban 176.53.45.51
2017-10-29 04:33:43,159 fail2ban.actions[485]: WARNING [ssh] Ban 180.107.165.214
2017-10-29 05:01:30,425 fail2ban.actions[485]: WARNING [ssh] Ban 211.137.13.185
2017-10-29 05:18:28,357 fail2ban.actions[485]: WARNING [ssh] Ban 60.165.208.28
2017-10-29 05:23:54,998 fail2ban.actions[485]: WARNING [ssh] Ban 52.172.183.252
2017-10-29 06:40:25,615 fail2ban.actions[485]: WARNING [ssh] Ban 123.201.150.161
2017-10-29 07:26:48,989 fail2ban.actions[485]: WARNING [ssh] Ban 47.92.90.178
2017-10-29 08:37:55,259 fail2ban.actions[485]: WARNING [ssh] Ban 162.252.90.101
2017-10-29 08:52:05,851 fail2ban.actions[485]: WARNING [ssh] Ban 113.108.9.83
2017-10-29 09:19:41,005 fail2ban.actions[485]: WARNING [ssh] Ban 202.100.182.250
2017-10-29 09:40:23,352 fail2ban.actions[485]: WARNING [ssh] Ban 177.129.243.217
2017-10-29 10:05:15,263 fail2ban.actions[485]: WARNING [ssh] Ban 116.3.97.37
2017-10-29 10:09:32,775 fail2ban.actions[485]: WARNING [ssh] Ban 177.182.183.80
2017-10-29 10:18:28,794 fail2ban.actions[485]: WARNING [ssh] Ban 14.207.47.23
2017-10-29 10:58:19,382 fail2ban.actions[485]: WARNING [ssh] Ban 222.103.136.182
2017-10-29 11:21:25,124 fail2ban.actions[485]: WARNING [ssh] Ban 50.16.205.210
2017-10-29 11:25:18,749 fail2ban.actions[485]: WARNING [ssh] Ban 89.174.165.239
2017-10-29 12:03:44,238 fail2ban.actions[485]: WARNING [ssh] Ban 96.58.244.206
2017-10-29 12:59:45,829 fail2ban.actions[485]: WARNING [ssh] Ban 180.183.103.78
2017-10-29 14:58:51,596 fail2ban.actions[485]: WARNING [ssh] Ban 34.212.43.93
2017-10-29 15:19:32,088 fail2ban.actions[485]: WARNING [ssh] Ban 118.144.138.198
2017-10-29 15:36:19,039 fail2ban.actions[485]: WARNING [ssh] Ban 27.130.161.38
2017-10-29 16:40:21,543 fail2ban.actions[485]: WARNING [ssh] Ban 167.61.227.141
2017-10-29 17:38:57,495 fail2ban.actions[485]: WARNING [ssh] Ban 190.3.69.170
2017-10-29 19:00:46,139 fail2ban.actions[485]: WARNING [ssh] Ban 186.60.79.174
2017-10-29 19:23:20,017 fail2ban.actions[485]: WARNING [ssh] Ban 31.207.47.109
2017-10-29 19:50:21,166 fail2ban.actions[485]: WARNING [ssh] Ban 92.154.87.111
2017-10-29 20:15:41,104 fail2ban.actions[485]: WARNING [ssh] Ban 177.86.79.2
2017-10-29 20:30:19,884 fail2ban.actions[485]: WARNING [ssh] Ban 197.43.16.78
2017-10-29 20:55:05,781 fail2ban.actions[485]: WARNING [ssh] Ban 179.228.250.62
Wie du sehen kannst, regelmäßig und etwas weniger als stündlich, versucht jemand, auf meinen Server zu kommen, obwohl alle Standardports (SSH zb) geändert wurden.
Und der Server ist grad mal eine Woche alt..