I originally set up OpenVPN Server with the default port 1194. Starting about a year ago, I noticed in the system log that a connection attempt to the OpenVPN server was made at least once every day. Fortunately, I am not using a default admin user id or password, and so the connection attempts failed, but left traces in the system log.Is there any reason to use a server port other than the default 1194? Just wondering if there are certain networks or ISP's that may for some reason block port 1194?
After I changed OpenVPN to use a completely non-standard port, the log entries stopped. Someone here (sorry, I forget who) mentioned that attackers try only the most commonly used ports - it wastes too much of their time to try all ports. So changing OpenVPN to a non-standard port adds an extra layer of security.
I have never been on a cruise ship, but I imagine that away from the coastline, they will have to use satelite communications. Satelite phone calls tend to be very expensive, and it's probably the same with data. If they block VPN access I would guess it is to reduce the data flow to affordable levels.Part of my question stems from reading forums that mention that vpn's will not work on the cruise ship that I am going on soon. Wasn't sure how they blocked vpn's. Thanks.
If you want to use VPN while on board, it might be good to use it in conjunction with something like Remote Desktop Services, which results in much less data being transmitted to and fro.
RDS itself seems to be quite vulnerable, and there have been several recent high-profile attacks. So IMHO it should only be used through a VPN tunnel.
Hope this helps