Cannot play with roommate on same wifi

Can't play with my brother while connected on the same network (on LAN). We're on PC, but from what I've found it happens on console as well.

We manage to finish at-least one game, and the host immediately times out the next time they start matchmaking. Having a third person not on the network hosting it results in one of us randomly disconnecting.

Playing solo or in a full party with people not on the same network is fine.

I've tried:

• Port Forwarding all required ports

• Port Triggering (TCP 3126, UDP 37005/37015 are the ports the game uses on both our PC's, allows both of us to connect and play maybe 1 game but one of us will freeze and timeout from the server early-mid game as opposed to timing out before character selection screen)

• Running Origin/OriginHostClient and Apex as Administrator

• Turning UPnP Off/On in the router (shouldn't have to do this, will literally need to port forward for every other multiplayer game afterwards, doesn't work anyway)

• Turning Off/On SSDP Discovery and UPnP Device Host (allows us to play maybe 3-4 games before problem starts again. tried in conjunction with UPnP off in router, same thing)

• Trying to use the +clientport xxxxx command in the launch options to force the game to use different ports (doesn't work at all, app still uses same ports and therefore talk over each other causing the disconnect).

• Flushing DNS

Another solution I've tried that semi-works better than the rest on my Netgear is changing the NAT Filtering setting from "Secured" to "Open", however from what I gather this setting opens a Full Cone NAT on your router which isn't safe, all my devices now get individually pinged and exposed to the internet. It also only works 50% of the time as we still get disconnects.

Setting up a DMZ is also out of the question, as its not worth the security risk as with the NAT filtering.

I also don't want to buy a VPN just to play this game. I shouldn't need to.

We literally don't have this problem with any other game, examples such as:

• R6: Siege

• For Honor

• The Division

• Battlefield 1 or V

• Battlefront 2

• Fortnite

• Squad

• Anthem Beta

• Star Wars: The Old Republic
• The Crew 2
• Planetside 2

Please Respawn, fix this, I'm not the only one with this issue.

• https://answers.ea.com/t5/Technical-Issues/Can-t-connect-to-Apex-Legends-server-while-on-the-same-network/td-p/7448044
• https://answers.ea.com/t5/Technical-Issues/Cannot-play-with-roommate-on-same-wifi/td-p/7420250
• https://www.reddit.com/r/apexlegends/comments/aop7f8/has_anyone_else_been_getting_this_a_lot/
• https://www.reddit.com/r/apexlegends/comments/anfqvf/connection_time_out_when_playing_w_roommates/
• https://www.reddit.com/r/apexlegends/comments/anjqdj/why_will_this_game_not_allow_people_playing_on/
• https://www.reddit.com/r/apexlegends/comments/ank3xb/cant_queue_with_anyone_on_same_network/
• https://www.reddit.com/r/apexlegends/comments/anjiut/players_with_same_ip_can_not_join_games_together/
• https://www.reddit.com/r/apexlegends/comments/an9qa2/unabletoconnect_when_host_and_party_on_same/
• https://www.reddit.com/r/apexlegends/comments/aolv6i/my_girlfriend_and_i_try_to_play_on_the_same_wifi/

AngryJoe also had this problem when trying to play the game with other Joe on the same LAN network in his review for this game.

TL;DR: more than one person can't play on the same network, playing solo is fine.