ZBX_TCP_READ() timed out: timeout while waiting for data

[Dicko]

I created two items for a host to measure the size of two directories (including subdirectories):
vfs.dir.size[c:\path\to\dir1]
vfs.dir.size[c:\path\to\dir2]

The directories are about 4 and 20 GB respectively.
In the configuration file I set the timeout to 30 seconds.

The first item works as expected.

From the agent log file, it seems as though the second item also functions as expected:

...
2564:20220105:111137.666 Requested [vfs.dir.size[c:\path\to\dir2]]
2564:20220105:111137.667 In zbx_execute_threaded_metric() key:'vfs.dir.size'
3444:20220105:111137.668 executing in data thread for key:'vfs.dir.size'
13932:20220105:111138.300 In send_buffer() host:'1.2.3.4' port:10051 entries:0/100
13932:20220105:111138.301 End of send_buffer():SUCCEED
6804:20220105:111138.318 In collect_perfstat()
6804:20220105:111138.322 End of collect_perfstat()
13932:20220105:111139.302 In send_buffer() host:'1.2.3.4' port:10051 entries:0/100
13932:20220105:111139.303 End of send_buffer():SUCCEED
...
6804:20220105:111151.393 In collect_perfstat()
6804:20220105:111151.397 End of collect_perfstat()
2564:20220105:111151.710 End of zbx_execute_threaded_metric():SYSINFO_SUCCEED ''
2564:20220105:111151.711 Sending back [20965308530]
13932:20220105:111152.340 In send_buffer() host:'1.2.3.4' port:10051 entries:0/100
13932:20220105:111152.341 End of send_buffer():SUCCEED
...

As seen in the log it takes 14 seconds to get the directory size and send the result. Well within the timeout of 30 seconds.
So I would assume I should get a result also for the second item, but I get this:

Name	Key	Type	Status	Info
dir1	vfs.dir.size[c:\path\to\dir1]	Zabbix Agent	Enabled
dir2	vfs.dir.size[c:\path\to\dir2]	zabbix Agent	Not supported	Timeout while waiting for data

Also when trying to test on the agent...

zabbix_agentd -t vfs.dir.size[c:\path\to\dir2]

...after only 3 seconds or so I get the timeout error.

What am I missing?

[Glencoe]

Probably you have increased Timeout parameter in zabbix_agentd.conf but haven't in zabbix_server.conf. The former limits time for check execution where as the latter is the wait time from the server side.

[Dicko]

Thanks for your suggestion. I will try setting this.
But when testing on the agent I get the same error. How is that possible?