Web Scenario failed - HTTP Error 503 not seen

[J_Adatasol]

Hi all,

I just had a problem with our Zabbix monitoring. We have a Web Scenario configured (using a template, applied to a couple of different servers) that monitors a web connection on these servers. This scenario is looking for HTTP codes 200 & 201.

Today, the server's HTTP system went down. When I manually tested the page I would get code = 503, but Zabbix was constantly reporting that it was getting code = 200 back. I ended up having to manually shut it down and restart it, instead of Zabbix automatically restarting things.

Where can I look to see why or how the Zabbix monitor was getting a different result than when I manually checked the page?

Thanks.

[Atsushi]

Are you check web.test.fail[] value in trigger expression?

[J_Adatasol]

No, I'm using specific Status Codes.

In Configuration -> Hosts -> <myhost> -> Web Scenarios
- I have defined a URL that it will check (using a custom macro I defined - "{WEBD.URL}")
- Then at the bottom I have set it to look for specific HTTP Status Codes: 200, 201







This configuration has been working correctly for a while - many months. But this one time, it failed. When I manually logged into the server and shutdown the web server part, Zabbix recognized that. But it did not recognize the problem with the web server reporting error = 503 (this was the state of things before I manually shut it down, in order to fix it).

[Atsushi]

Did you test when it timed out?
Has a timeout occurred and the value of web.test.fail[] fails, and the value of web.test.rspcode[] remains old and has not been updated? What if you try to check both the web.test.fail[] value and the web.test.rspcode[] value in the trigger expression?

[J_Adatasol]

This issue just happened again.

When trying to access the webpage on this server, it returned a Error Code 503, but Zabbix was happy as a clam and indicated that it was receiving Code = 200 and did not report any problems (and thus did not respond to fix the issue).

[J_Adatasol]

Did you test when it timed out?
Has a timeout occurred and the value of web.test.fail[] fails, and the value of web.test.rspcode[] remains old and has not been updated? What if you try to check both the web.test.fail[] value and the web.test.rspcode[] value in the trigger expression?

Here is my TRIGGER for this web test:
{<server>:web.test.fail[Web_Check].count(120,0,gt)}>1

So I am only testing "web.test.fail[]".

But in my 'Web Scenario', I'm testing for both the Response Code and for a specific string in the response page. Both of those tests should be failing in this case.

By the way - this is running Zabbix Server v3.4.15.

[J_Adatasol]

I believe that I have figured out part of my problem - but not exactly what the full solution is yet.

The problem was that the URL being tested was just hitting a landing page; the landing page has some Javascript that runs on it and tests the next step in the process. It's the next step that is failing - the landing page DOES return Code = 200.

So...to automatically bypass the Javascript and directly go to the 'next step' in the process, I CAN provide a more detailed URL. But I'm not quite seeing how to append one part of the URL that I would like to include. Here's the URL format I'm trying to mimic:

https://{HOST.HOST}/fmi/webd/<filename>?homeurl=http://{HOST.HOST}/logout.html#<filename>

I'm trying to populate "<filename>" with a Host-defined macro value. The first instance of I have working, but the second piece, the one after the "#", isn't. I tried entering that URL into the Web Scenarios and click 'Parse', but it removes the piece after the "#" - it disappears.

Also...how can I get the last HTTP Response Code value to show up in the email that is sent out to people on the 'Actions' Operation? Using {Item.value} just returns 1 - the value from the Trigger (which only returns binary results), which is itself responding to the value (step number that failed) of the Web Scenario. I can see the Response Code in the Web Scenario's data - is that value available in the Actions -> Operations context?