one internal Zabbix process (like the main server) tried to communicate with another service (like the preprocessing service ) that had already closed the connection or crashed Most Common Causes & Solutions Operating System File Limits
| Symptom | Likely fix | |---------|-------------| | Error after Zabbix restart | Remove stale IPC sockets | | Error on high load | Increase StartTrappers , StartPollers , check LimitNOFILE | | Error on specific host | Increase Timeout on that agent | | Error only with active checks | Match server/agent Timeout , check network stability | | Error + disk full | Clean /tmp or /var/run | zabbix cannot write to ipc socket broken pipe upd