You may also be able to help with this. I have a urbackup server on the same network. And I don’t open ports to it in any way. Urbackup address 192.168.2.222:55415 ipfire address 192.168.2.254 microtick 192.168.2.1. I do this: Mikrotik forward 55415 to 192.168.2.254 and ipfire forward 55415 to 192.168.2.222. Everything does not connect
you may need different ports, see section 10.3 of the urbackup manual
https://www.urbackup.org/administration_manual.html#x1-600008.3
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I know I need ports 55415 and 55414. Until I had ipfire there were no problems. With mikrotik, I opened those pots and everything worked.
Unless you have your mikrotik router in bridge mode, you probably have a double NAT problem, which is a two layers of network address translation of the internet traffic (first from the mikrotik and second from the ipfire box). You either set the mikrotik to bridge mode with the IPFire machine (if allowed) or in alternative - again, if possible by the firmware - you have to do something similar to what it is described in the wiki for google fiber. Briefly, you need to put the IPFire machine in the DMZ of the mikrotik and forward all the traffic from internet to it. I would also use a different IP address scheme between the two networks to avoid any confusion when troubleshooting (e.g. 10.x.x.x for the ipfire machine in the mikrotik DMZ network and 192.168.x.x for the IPFire network).