Using Putty to SSH into a remote Linux (CentOS 7) server from a Windows 10 machine. I would like to know if it's possible to designate a port from which Putty connects to the server.
The backstory:
The server in question has a public IPv4 address, and hence has had its SSH port changed to alleviate brute force attacks. However, I think by the virtue of me having connected from an insecure WIFI hotspot, some attacker has managed to obtain the correct SSH port - recently I have seen a great influx of brute force login attempts that weren't here before.
cat /var/log/secure shows that the attacker(s) come from multiple IP addresses, but they only seem to be using a handful of source ports. Therefore I would like to set up my firewall to only allow incoming SSH connections from a specific source port, in the hopes of slightly improving my security.
0 Answers