This is the most common reason the internal socket "breaks." When Zabbix hits its operating system limit for open files, it can no longer maintain IPC (Inter-Process Communication) channels. Increase the for the Zabbix user. Check current limits with cat /proc/ /limits | grep open and adjust them in /etc/security/limits.conf (e.g., set to 4096 or higher). Service Crashes or Timeout: If a core service like the preprocessing service
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The recommended fix is simple: The zabbix user should be a system account that cannot log into the system (no login shell, no password). zabbix cannot write to ipc socket broken pipe upd
zabbix soft nofile 65536 zabbix hard nofile 65536 zabbix soft nproc 65536 zabbix hard nproc 65536
If the cache is full, increase the cache size in /etc/zabbix/zabbix_server.conf : This is the most common reason the internal socket "breaks
cannot write to IPC socket: Broken pipe
Then:
Summary
The error in Zabbix typically indicates that a communication channel between internal Zabbix processes has been unexpectedly severed. While your query includes "upd" (likely referring to "update" or an "upgrade"), this specific error often surfaces after a version upgrade, such as to Zabbix 6.0 or higher. Common Causes Service Crashes or Timeout: If a core service