share your server log.
[10:04:00] [Worker-Main-6/INFO] [minecraft/LoggingChunkStatusListener]: Preparing spawn area: 96%
[10:04:00] [Worker-Main-5/INFO] [minecraft/LoggingChunkStatusListener]: Preparing spawn area: 98%
[10:04:01] [Server thread/INFO] [minecraft/LoggingChunkStatusListener]: Preparing spawn area: 99%
[10:04:01] [Server thread/INFO] [minecraft/LoggingChunkStatusListener]: Time elapsed: 17631 ms
[10:04:01] [Server thread/INFO] [minecraft/DedicatedServer]: Done (18.110s)! For help, type "help"
[10:04:01] [Server thread/INFO] [minecraft/DedicatedServer]: Starting GS4 status listener
[10:04:01] [Server thread/INFO] [minecraft/RConThread]: Thread Query Listener started
[10:04:01] [Query Listener #1/INFO] [minecraft/QueryThread]: Query running on 0.0.0.0:9898
[10:04:11] [Server thread/INFO] [co.wi.bl.Blocklings/]: Creating trees list.
[10:04:37] [Server thread/INFO] [minecraft/ServerLoginNetHandler]: Disconnecting com.mojang.authlib.GameProfile@2c537422[id=<null>,name=timkakimka,properties={},legacy=false] (/178.213.2.71:51415): Took too long to log in
[10:04:37] [Server thread/INFO] [minecraft/ServerLoginNetHandler]: com.mojang.authlib.GameProfile@2c537422[id=<null>,name=timkakimka,properties={},legacy=false] (/178.213.2.71:51415) lost connection: Took too long to log in