subsearch not working

[benzmmrmnn86]

I have an alert using a subsearch that was working a few weeks ago. Now all of a sudden i cannot get any subsearchs to work. A very simple search i performed is:

index=IndexName sourcetype=WindowsEventLogs [search sourcetype="VPNLogs" CN=Ben_zimmermann
| table CN]

If i perform each search individually, i get results but when i put them together, i do not get any results.

[gcusello]

HI @benzmmrmnn86,
when you run the subsearch by itself, what's the number of results?
remember that there's the limit of 50,000 results in subsearches, so if you have more results. maybe the ones you need are the exceeding part of results.
You could modify subsearch as the following:

index=IndexName sourcetype=WindowsEventLogs [search index=my_index sourcetype="VPNLogs" CN=Ben_zimmermann
| dedup CN | table CN]

Then I agree with @oscar84x: it's a good practice to use always the index in every search and subsearch.

Ciao.
Giuseppe

[jpolvino]

Can you please run it against a time period that is known to be good? You mention a few weeks, so try a little before that when you know you had positive alerts. Maybe the composition of your logs has changed.

[oscar84x]

Off the top of my head, could you try specifying the index in the subsearch?