This issue happens at least twice per week while we host five servers with the shards. The problem is that all players can not connect to the other shard (the caves or the master). We can fix this problem only by restarting the server or waiting like an hour.
I noticed this is the major issue (Master log):
[22:35:29]: CURL ERROR: (login.kleientertainment.com) Operation too slow. Less than 5 bytes/sec transferred the last 60 seconds [22:35:29]: [ValidateGameSessionTokenResponse] Network Failure (0) [22:35:29]: CloseConnectionWithReason: ID_DST_GAME_SESSION_AUTH_FAILED [22:35:38]: [Shard] Migration by user ('KU_SFlxL9Pf') failed (178).
and cave log:
[22:35:38]: [Shard] Migration for KU_SFlxL9Pf timed out. [22:35:38]: [Shard] Cancelling pending migration #130 for (KU_SFlxL9Pf) [22:35:38]: Registering master server in EU lobby
meanwhile client log:
[01:41:20]: Connection accepted to 220.127.116.11|14001 <8773861673417112171> [01:41:20]: Network external address discovered: 18.104.22.168|65197 [01:41:20]: SendClientHandShakePacket to <8773861673417112171> [01:41:46]: focus lost [01:41:54]: focus gained [01:41:55]: focus lost [01:42:08]: focus gained [01:42:09]: focus lost
Full master log: https://dontfight.club/test/master_bug_caves_log2.txt
Full caves log: https://dontfight.club/test/cave_bug_caves_log2.txt
Client log is in the attachment. However this one might be outdated.
See the issue description.