You can remove the portal link by logging in to the UMC (Univention Management Console), visiting the “LDAP directory” module, navigating to
portal in the LDAP tree and deleting the corresponding entry.
Firewall rules are stored as UCR (Univention Config Registry) variables. You can browse and delete them manually, either from the command line with the
ucr command or from within the UMC: “System” → “Univention Config Registry”. Afterwards make sure to restart the
I don’t entirely agree that this is really a security risk. It is only a risk if there’s actually a program listening on one of the open sockets. If there isn’t, then the operating system will simply respond with “nothing to see here, move along” to connection attempts on the unblocked ports. Strictly speaking the firewall rules should have been removed, true, but the risk isn’t suddenly higher than it was before OPSI was installed.