в логах прокси Error ZBX_TCP_READ

[ugh]

40579:20090812:171807 Error while receiving answer from server [ZBX_TCP_READ() failed [Interrupted system call]]
40579:20090812:171807 Heartbeat message failed

периодически(!) начинает валится в лог заббикс_прокси
ни на один сетевой уровень грешить вроде не стоит

по какой схеме прокся сообщает серверу что она жива?
может в мускуль заноситься что-то не успевает?

[ugh]

перегруженный mysql дает такой эффект

[titov]

У меня похожая проблема, стаит cisco 1812, с firewall порты опубликованы, сессия установлена, а в логах zabbix:
4701:20091223:200121 NODE 5: Sending configuration changes to master node 1 for node 5 datalen 4099628
4701:20091223:200227 NODE 5: Unable to connect to Node [1] error: Cannot connect to [212.45.20.130:10051] [Connection timed out]
4701:20091223:200400 NODE 5: Error while receiving answer from Node [1] error: ZBX_TCP_READ() failed [Connection reset by peer]
4701:20091223:200553 NODE 5: Error while receiving answer from Node [1] error: ZBX_TCP_READ() failed [Connection reset by peer]
4701:20091223:200748 NODE 5: Error while receiving answer from Node [1] error: ZBX_TCP_READ() failed [Connection reset by peer]
4701:20091223:201002 NODE 5: Error while receiving answer from Node [1] error: ZBX_TCP_READ() failed [Connection reset by peer]
4701:20091223:201153 NODE 5: Error while receiving answer from Node [1] error: ZBX_TCP_READ() failed [Connection reset by peer]
4701:20091223:201413 NODE 5: Error while receiving answer from Node [1] error: ZBX_TCP_READ() failed [Connection reset by peer]
4701:20091223:201607 NODE 5: Error while receiving answer from Node [1] error: ZBX_TCP_READ() failed [Connection reset by peer]
4701:20091223:201629 NODE 5: Sending configuration changes to master node 1 for node 5 datalen 4099628
4701:20091223:201829 NODE 5: Error while sending data to Node [1] error: ZBX_TCP_WRITE() failed [Connection reset by peer]
4701:20091223:202045 NODE 5: Sending configuration changes to master node 1 for node 5 datalen 4099628
4701:20091223:204855 NODE 5: Error while receiving answer from Node [1] error: ZBX_TCP_READ() failed [Connection reset by peer]
4701:20091223:205123 NODE 5: Error while receiving answer from Node [1] error: ZBX_TCP_READ() failed [Connection reset by peer]

При этом на cisco сессия установлена...

Established Sessions
Session 839A4E18 (192.168.101.10:54364)=>(212.45.xx.xxx:10051) tcp SIS_OPEN

Кто-нибудь сталкивался с такими проблемами?
С чем это может быть связано?