We have a server that became inaccessibel after our network supplier changed out external IP adres.
The server runs ubuntu 16.04 LTS, and access to port 22 is limited to our old IP. Only ports 8080, and 443 (Tomcat, SSL and non-SSL) is available.
The server is a virtual server, hosted by a third party. I can boot the server into a recovery mode, where I can access the whole filesystem under /recovery. Afterwords a can boot up again.
Question is, what changes I can make to the file system, so that I can access the server after reboot.
Ideally disable, or change iptables firewall.