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For IKE and IPsec, we are adding support for IKE over TCP and ESP over TCP. This uses port 4500.

I also updated the rather old description of the service in the upstream PR I filed for this.

The Linux kernel for 8.3.0 should already support this for IPsec over TCP

Libreswan 3.33 will add support for IKE over TCP. This is planned for RHEL 8.4.0

upstream PR:  https://github.com/firewalld/firewalld/pull/665

upstream:

  8c4fb4f65871 ("improvement(service): IPsec: Update description and add TCP port 4500")

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (firewalld bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:1643