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Forwarding ports is unnecessary. The error you posted is normal.
The main issue is this:
java.util.concurrent.CancellationException: null at java.base/java.util.concurrent.CompletableFuture.cancel(CompletableFuture.java:2468) at com.faforever.iceadapter.ice.PeerIceModule.lambda$gatherCandidates$4(PeerIceModule.java:118) at com.faforever.iceadapter.util.Executor.lambda$executeDelayed$0(Executor.java:16) at java.base/java.lang.Thread.run(Thread.java:832) Nov 30, 2020 8:17:08 PM com.nbarraille.jjsonrpc.JJsonPeer sendNotification INFO: Sending Notification:{"method":"onIceConnectionStateChanged","params":[82574,47273,"disconnected"],"jsonrpc":"2.0"} Nov 30, 2020 8:17:08 PM org.ice4j.util.Logger log INFO: ICE state changed from Waiting to Terminated. Local ufrag 357851eod9cggh Nov 30, 2020 8:17:08 PM org.ice4j.util.Logger log INFO: Failed to receive: java.net.SocketException: socket closed Nov 30, 2020 8:17:08 PM org.ice4j.util.Logger log INFO: Closing. Nov 30, 2020 8:17:08 PM org.ice4j.util.Logger log INFO: Failed to receive: java.net.SocketException: Socket closed Nov 30, 2020 8:17:08 PM org.ice4j.util.Logger log INFO: Failed to receive: java.net.SocketException: Socket closed Nov 30, 2020 8:17:08 PM org.ice4j.util.Logger log INFO: Failed to receive: java.net.SocketException: Socket closed Nov 30, 2020 8:17:08 PM org.ice4j.util.Logger log INFO: Failed to receive: java.net.SocketException: Socket closed Nov 30, 2020 8:17:08 PM org.ice4j.util.Logger log INFO: Failed to receive: java.net.SocketException: Socket closed Nov 30, 2020 8:17:08 PM org.ice4j.util.Logger log INFO: Failed to receive: java.net.SocketException: Socket closed
This means your operating system or antivirus is closing the socket and not telling the adapter why. This only occurs on less than a few percent of devices. I spent a lot of time debugging that and sadly didn't find a solution, the issue lies somewhere within proprietary code of your operating system manufacturer.
Try the options suggested in https://wiki.faforever.com/index.php?title=Connection_issues_and_solutions#Unable_to_connect_to_someone in the order they're listed in. Each is more likely to fix the issue, e.g. VPN worked on one of my machines when I had that issue.