Web scenario step - error: error doing curl_easy_perform: Couldn't resolve host name

[cparrot]

Hi,

I've been using Web scenario step for some time now with no issues, suddenly today for some reason, most of the web checks are coming back with:

Web scenario step [1 of 1] error: error doing curl_easy_perform: Couldn't resolve host name

and sometimes I found this in the logs:

Web scenario step [1 of 1] error: error doing curl_easy_perform: Timeout was reached

When I restart the zabbix process (

/etc/init.d/zabbix_server stop; /etc/init.d/zabbix_agent stop; sleep 2; /etc/init.d/zabbix_server start; /etc/init.d/zabbix_agent start

), all web scenario running successfully again, but shortly after (~ 24 hours later), they fall back again with the same errors.

I tried to increase the "Timeout" variable in the /etc/zabbix/zabbix_server.conf file (Default Timeout=3 by Timeout=20), but this does not solve the problem!

I've checked and the server can both look up the IP address from the name, and i can use curl to get the webpage, both using http:// and not using http://. However in the web checks i'm getting the errors!

Nothing has changed on the server, so I'm pretty confused as to where the error is coming from!

OS Configuration:

Ubuntu Server 10.04.3 LTS (Virtual machine ESXi 4.1.0)
Zabbix 1.8.5
8 GB RAM
Virtuals processors: 4
mysql-server 5.1.41

Thanks in advance for your help!

[zaicnupagadi]

Hi!

The same thing happens to me, normally my website responds quite quick, but sometimes I have that curl issue and the trigger goes crazy and so the management

I have got such an error:

1941:20120127:202134.874 Web scenario step [www.WEBSITE.pl:www] error: error doing curl_easy_perform: Timeout was reached

My configuration is:
Zabbix 1.8.10-1
RHEL 6.1
8GB ram
4 virt processors

[cparrot]

Hi,

Look at the parameters of your Zabbix server configuration:

StarPollers
StartHTTPPollers
Timeout

I managed to give back the stability to my server by tuning these settings there.

[trixbox]

Solution

J had the same problem.
J changed dns servers to google dns 8.8.8.8 and 8.8.4.4.
Now works fine!

To change dns servers type:

nano /etc/resolv.conf

[Grossx]

Same problem

I have the same problem. It started with version 2.2 when http proxy field was implemented. All my old webchecks are working fine but any new webcheck that i create will fail with "Couldn't resolve proxy name". This happens even if I check an IP address as opposed to DNS-name.

[sorin]

I have the same problem on a basic setup, and the workarounds above do not solve the problem. Seems that we need to reopen https://support.zabbix.com/browse/ZBX-7834

Note: in my case I always get the error, not after a while.