Okay let me explain what our plan was. We have two wifi signals in out house. We port forwarded and ran the server on signal 1 first, and we got the Java.io error. Then we thought if we run it on signal 2 we wont get this problem, but we still do.
Thank you for these optoins. We tried them, but to no avail.
1. changing to 512 did not help. 2. This did help to get rid of the flying problem. 3. The loading times arent the issue. 4. The port forward is correct. 5. We dont have any plugins installed at all.
It's a ziggo router. I don't know what model exactly. Mc version 1.14.4 The server is port forwarded on the same network as I log in on. So I guess locally.