How to diagnose HTTP request failed, Couldn't resolve host

Not sure where to post this. I’m getting this error:

Solarium_Model_Engine->ping: Solr HTTP error: HTTP request failed, Couldn’t resolve host ‘’

I’m trying to make a connection on port 443.

How can diagnose this? I don’t know how to know if its something wrong with the scripts or something wrong with just connecting or what?

Thank you

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