You can configure the firewall of your 1&1 Virtual Server Linux without being logged in to the system via SSH as the root user. If you have blocked SSH access through iptables, you can use the steps outlined below to re-enable SSH access by using the firewall module in Virtuozzo.
Now you will see more technical details about the firewall setup. You can now manage rules for incoming connections (Input tab) as well as the outgoing connections (Output tab) and forwarding rules (Forward tab).
Use the buttons on this screen to enable/disable specific rules, re-order the list using the up and down arrow buttons, or delete or add rules.
Do not forget that in the Advanced Firewall Mode you will need to manage both the Input and Output rules to ensure that the security of the server will perform as intended.