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[21:22:30] [Worker-Main-429/WARN]: Couldn't look up profile properties for com.mojang.authlib.GameProfile@3cc40bc8[id=9e69a7e0-5fcd-3b8b-8c7f-847ba30156d2,name=AnTrc2,properties={},legacy=false]
com.mojang.authlib.exceptions.AuthenticationUnavailableException: Cannot contact authentication server
at com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService.makeRequest(YggdrasilAuthenticationService.java:126) ~[authlib-3.3.39.jar:?]
at com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService.makeRequest(YggdrasilAuthenticationService.java:100) ~[authlib-3.3.39.jar:?]
at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService.fillGameProfile(YggdrasilMinecraftSessionService.java:194) ~[authlib-3.3.39.jar:?]
at com.mojang.authlib.yggdrasil.YggdrasilMinecraftSessionService.fillProfileProperties(YggdrasilMinecraftSessionService.java:187) ~[authlib-3.3.39.jar:?]
at net.minecraft.world.level.block.entity.TileEntitySkull.c(SourceFile:141) ~[spigot-1.18.2-R0.1-SNAPSHOT.jar:3498-Spigot-b081915-10ba1be]
at net.minecraft.SystemUtils.a(SourceFile:493) ~[spigot-1.18.2-R0.1-SNAPSHOT.jar:3498-Spigot-b081915-10ba1be]
at net.minecraft.world.level.block.entity.TileEntitySkull.a(SourceFile:136) ~[spigot-1.18.2-R0.1-SNAPSHOT.jar:3498-Spigot-b081915-10ba1be]
at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1395) [?:?]
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373) [?:?]
at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182) [?:?]
at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655) [?:?]
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622) [?:?]
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165) [?:?]
Caused by: java.net.SocketTimeoutException: Read timed out
at sun.nio.ch.NioSocketImpl.timedRead(NioSocketImpl.java:288) ~[?:?]
at sun.nio.ch.NioSocketImpl.implRead(NioSocketImpl.java:314) ~[?:?]
at sun.nio.ch.NioSocketImpl.read(NioSocketImpl.java:355) ~[?:?]
at sun.nio.ch.NioSocketImpl$1.read(NioSocketImpl.java:808) ~[?:?]
at java.net.Socket$SocketInputStream.read(Socket.java:966) ~[?:?]
at sun.security.ssl.SSLSocketInputRecord.read(SSLSocketInputRecord.java:484) ~[?:?]
at sun.security.ssl.SSLSocketInputRecord.readHeader(SSLSocketInputRecord.java:478) ~[?:?]
at sun.security.ssl.SSLSocketInputRecord.decode(SSLSocketInputRecord.java:160) ~[?:?]
at sun.security.ssl.SSLTransport.decode(SSLTransport.java:111) ~[?:?]
at sun.security.ssl.SSLSocketImpl.decode(SSLSocketImpl.java:1510) ~[?:?]
at sun.security.ssl.SSLSocketImpl.readHandshakeRecord(SSLSocketImpl.java:1425) ~[?:?]
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:455) ~[?:?]
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:426) ~[?:?]
at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:589) ~[?:?]
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:187) ~[?:?]
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1665) ~[?:?]
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1589) ~[?:?]
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:224) ~[?:?]
at com.mojang.authlib.HttpAuthenticationService.performGetRequest(HttpAuthenticationService.java:140) ~[authlib-3.3.39.jar:?]
at com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService.makeRequest(YggdrasilAuthenticationService.java:105) ~[authlib-3.3.39.jar:?]
... 12 more

Bạn thử bât phần "global-api-cache" ở spigot.yml lên nhé xem có giảm không.
Nếu không có thì tự thêm vào là được nhé
global-api-cache: true

Server đang tra cứu đầu của người chơi và gửi dữ liệu về mojang. Bạn có thể bỏ qua vì nó không phải là lỗi, đây là do bên plugin Floodgate nhé