T2 Field Engineers should be given the opportunity to build T1 Power Generators. Primarily because of the T2 Arty.

Try a ping network test via cmd.

Just search for cmd in Windows and ping google for 5 minutes:

ping www.google.com -t

Or check it via this page: https://ping.canbeuseful.com/#ping

If there are high pings or timeouts, your general connection is unstable.

If everything is stable, try using a VPN.

Note: In the FaF client, I have had the best results so far when I have selected “US East” as the only one under Preferred Coturns for ICE.

Apparently, automatically kicked observers keep trying to establish a connection.
This then continues for the entire match.
Bug?

If you block the faf coturn server selected in the settings, you cannot connect to other players.
So a coturn server is always used?

Germany 1 = Hetzner (Dedicated Server?) always same IP
Finland = Hetzner (Dedicated Server?) always same IP
US East = Hetzner (Cloud?) always same IP although cloud?
Global = xirsys / DigitalOcean (Cloud?) mostly always a different IP

As the only coturn server, what does Global actually want with port 80?

Example:

Germany 1:
INFO Using all viable ice servers: [94.130.225.99:3478/tcp, 94.130.225.99:3478/udp] (c.f.iceadapter.ice.PeerIceModule:177)
INFO Using all viable ice servers: [94.130.225.99:3478/tcp, 94.130.225.99:3478/udp] (c.f.iceadapter.ice.PeerIceModule:177)
INFO Using all viable ice servers: [94.130.225.99:3478/tcp, 94.130.225.99:3478/udp] (c.f.iceadapter.ice.PeerIceModule:177)
INFO Using all viable ice servers: [94.130.225.99:3478/tcp, 94.130.225.99:3478/udp] (c.f.iceadapter.ice.PeerIceModule:177)
INFO Using all viable ice servers: [94.130.225.99:3478/tcp, 94.130.225.99:3478/udp] (c.f.iceadapter.ice.PeerIceModule:177)
INFO Using all viable ice servers: [94.130.225.99:3478/tcp, 94.130.225.99:3478/udp] (c.f.iceadapter.ice.PeerIceModule:177)
INFO Using all viable ice servers: [94.130.225.99:3478/tcp, 94.130.225.99:3478/udp] (c.f.iceadapter.ice.PeerIceModule:177)
INFO Using all viable ice servers: [94.130.225.99:3478/tcp, 94.130.225.99:3478/udp] (c.f.iceadapter.ice.PeerIceModule:177)
INFO Using all viable ice servers: [94.130.225.99:3478/tcp, 94.130.225.99:3478/udp] (c.f.iceadapter.ice.PeerIceModule:177)
INFO Using all viable ice servers: [94.130.225.99:3478/tcp, 94.130.225.99:3478/udp] (c.f.iceadapter.ice.PeerIceModule:177)
INFO Using all viable ice servers: [94.130.225.99:3478/tcp, 94.130.225.99:3478/udp] (c.f.iceadapter.ice.PeerIceModule:177)
INFO Using all viable ice servers: [94.130.225.99:3478/tcp, 94.130.225.99:3478/udp] (c.f.iceadapter.ice.PeerIceModule:177)
INFO Using all viable ice servers: [94.130.225.99:3478/tcp, 94.130.225.99:3478/udp] (c.f.iceadapter.ice.PeerIceModule:177)

Global:
INFO Using all viable ice servers: [207.154.234.214:3478/tcp, 207.154.234.214:3478/udp, 207.154.234.214:80/udp, 207.154.234.214:80/tcp] (c.f.iceadapter.ice.PeerIceModule:177)
INFO Using all viable ice servers: [207.154.234.214:3478/tcp, 207.154.234.214:3478/udp, 207.154.234.214:80/udp, 207.154.234.214:80/tcp] (c.f.iceadapter.ice.PeerIceModule:177)
INFO Using all viable ice servers: [207.154.234.214:3478/tcp, 207.154.234.214:3478/udp, 207.154.234.214:80/udp, 207.154.234.214:80/tcp] (c.f.iceadapter.ice.PeerIceModule:177)
INFO Using all viable ice servers: [207.154.234.214:3478/tcp, 207.154.234.214:3478/udp, 207.154.234.214:80/udp, 207.154.234.214:80/tcp] (c.f.iceadapter.ice.PeerIceModule:177)
INFO Using all viable ice servers: [207.154.234.214:3478/tcp, 207.154.234.214:3478/udp, 207.154.234.214:80/udp, 207.154.234.214:80/tcp] (c.f.iceadapter.ice.PeerIceModule:177)
INFO Using all viable ice servers: [207.154.234.214:3478/tcp, 207.154.234.214:3478/udp, 207.154.234.214:80/udp, 207.154.234.214:80/tcp] (c.f.iceadapter.ice.PeerIceModule:177)
INFO Using all viable ice servers: [207.154.234.214:3478/tcp, 207.154.234.214:3478/udp, 207.154.234.214:80/udp, 207.154.234.214:80/tcp] (c.f.iceadapter.ice.PeerIceModule:177)
INFO Using all viable ice servers: [207.154.234.214:3478/tcp, 207.154.234.214:3478/udp, 207.154.234.214:80/udp, 207.154.234.214:80/tcp] (c.f.iceadapter.ice.PeerIceModule:177)
INFO Using all viable ice servers: [207.154.234.214:3478/tcp, 207.154.234.214:3478/udp, 207.154.234.214:80/udp, 207.154.234.214:80/tcp] (c.f.iceadapter.ice.PeerIceModule:177)
INFO Using all viable ice servers: [207.154.234.214:3478/tcp, 207.154.234.214:3478/udp, 207.154.234.214:80/udp, 207.154.234.214:80/tcp] (c.f.iceadapter.ice.PeerIceModule:177)
INFO Using all viable ice servers: [207.154.234.214:3478/tcp, 207.154.234.214:3478/udp, 207.154.234.214:80/udp, 207.154.234.214:80/tcp] (c.f.iceadapter.ice.PeerIceModule:177)
INFO Using all viable ice servers: [207.154.234.214:3478/tcp, 207.154.234.214:3478/udp, 207.154.234.214:80/udp, 207.154.234.214:80/tcp] (c.f.iceadapter.ice.PeerIceModule:177)
INFO Using all viable ice servers: [207.154.234.214:3478/tcp, 207.154.234.214:3478/udp, 207.154.234.214:80/udp, 207.154.234.214:80/tcp] (c.f.iceadapter.ice.PeerIceModule:177)

1. Can I see in the logs/debugger which player is in my lobby and has coturn server connections?
2. Can I prevent this by not allowing coturn server connections (so, I could have the IPs and block them as hosts in my firewall, then no more players can get into my lobby - there are only 4 Germany 1 / Finland / USA East / Global of them - or are there several and only the key regions are listed)?
3. When you switch from the lobby to the actual game, are all connections renegotiated, right or wrong? And what happens in the lobby is just a rudimentary check to see if it works at all with the connections?
4. What about the option “Allow the ICE adapter to use IPv6”? It says that it causes connection problems for some players, but what advantage does it have in general (more stable connections when a connection is established?)?
5. What actually causes the lag in a DDoS when players are in the game, if it's just P2P connections? If players are connected to coturn servers and these are then attacked (the coturn servers - are they attacked at all?), or are there other services that limit the game (live replay?)? Does the player still have connections to FaF service servers during the game, which can cause lag (in-game behind issues)?

Psychology plays a major role in the games industry.
https://www.youtube.com/watch?v=mpTBYiUSidA

Minus ranks could demotivate new players and make them feel hopeless.

I imagine finding a match is also quite difficult, at least these players are kicked very often.

It doesn't affect me, but I keep seeing players with a minus rank.
What is the deeper meaning of minus ranks?
Wouldn't it make more sense to limit the lowest limit to 0?

This unit is not popular (my subjective perception).

I personally used this unit a few times and always came to the conclusion in combat that the lack of ability to build T1 Pgen (for T2 Arty) is a no go. Because at the stage of the game where this unit could be useful, this is important (every single shot counts).

I only use normal T2 Engis now and have done better against my opponent than with Field Engineers.

I would like to hear from others who actively use this unit, preferably with gameplay.

For me it's not a problem that T3 subs are strong against water units, but the anti-air ability is just op.
I would take the anti-air away from the T3 subs.
The current situation is that if your opposite T3 Sera Subs, you basically have to do the same or you lose.

T2 Field Engineers should be given the opportunity to build T1 Power Generators. Primarily because of the T2 Arty.

Yes, if it doesn't move and then has the ability to turn slightly in position to use 3/4 main guns.
But I don't find that really satisfying. Since you keep the Fatboy moving most of the time, you often can't use its already quite bad possibilities against other T4 units of the other factions.
Every other T4 unit can make full use of its main firepower if you assign it to a target (if you advance and go on the offensive). Only the Fatboy can't, because a few degrees are missing for the rear turrets.
And yes, the full name is "UEF Experimental Mobile Factory" and not mobile arty. Nevertheless, it is not used because of its construction possibilities but because of its turrets. Just like the Atlantis for torps and anti-air or CZAR for its Independence Day White House Laser + Allahu Snackbar Crash Landing.