Zabbix agent on is unreachable for 5 minutes

[Leehom]

Hi Expert

My zabbix version is 3.2.1.
# rpm -qa | grep zabbix
zabbix-web-3.2.1-1.el7.noarch
zabbix-server-mysql-3.2.1-1.el7.x86_64
zabbix-get-3.2.1-1.el7.x86_64
zabbix-web-mysql-3.2.1-1.el7.noarch
zabbix-agent-3.2.1-1.el7.x86_64
zabbix-sender-3.2.1-1.el7.x86_64

I'm facing a problem that sometimes I will receive alerts like "Zabbix agent is unreachable for 5 minutes", but when I check the latest data of item agent.ping for that server, I found actually there is data during that period.
I'm using build-in "Template App Zabbix Agent" without doing any change.
When I check the performance of internal process of zabbix, I find that the history syncer process is very busy at the point problem happen.




Besides history cache is almost not used at the point problem happen as well.

[Arsch gei ge]

The same here. It started after upgrade server to v. 4.0.1 5 sec because I changed it instead of 15 sec.

11902:20181123:144831.720 resuming Zabbix agent checks on host "hostname1": connection restored
11898:20181123:145116.458 Zabbix agent item "net.if.out[br-5804ed88f0bb]" on host "hostname2" failed: first network error, wait for 5 seconds
11899:20181123:145116.804 Zabbix agent item "system.cpu.switches" on host "hostname1" failed: first network error, wait for 5 seconds
11902:20181123:145152.788 resuming Zabbix agent checks on host "hostname2": connection restored
11902:20181123:145201.949 resuming Zabbix agent checks on host "hostname1": connection restored
11899:20181123:145332.377 Zabbix agent item "system.users.num" on host "hostname1" failed: first network error, wait for 5 seconds
11902:20181123:145404.329 resuming Zabbix agent checks on host "hostname1": connection restored
11898:20181123:145640.343 Zabbix agent item "vfs.fs.inode[/etc/resolv.conf,pfree]" on host "hostname1" failed: first network error, wait for 5 seconds
11902:20181123:145731.692 resuming Zabbix agent checks on host "hostname1": connection restored

Agent

Nov 23 17:41:10 agent-hostname1 zabbix-agent[23090]: 60:20181123:144110.622 active check configuration update from [server1:10051] started to fail (cannot connect to [[server1]:10051]: [111] Connection refused)
Nov 23 17:41:13 agent-hostname1 zabbix-agent[23090]: 61:20181123:144113.573 active check configuration update from [server2:10051] started to fail (cannot connect to [[server2]:10051]: [4] Interrupted system call)

Look like solution found https://www.zabbix.com/forum/zabbix-...555#post369555 but not for my situation. I guess it's a bug.

[karanik]

Hello,
After 3+ years anyone who find the way to fix that?

[karanik]

I resolve this by raising Timeout on the configuration of client.