Can't connect to gotosolr.com hosted Solr

First, thank you for your plugin.

I can’t connect the plugin to my index, which uses https and basic http authentification.

In the Solr host field, I use a syntax like: https://user:[email protected]

The “Check Solr instance settings” displays no error, just the orange icon.

Thank you for your help.

https://www.ads-software.com/plugins/advanced-search-by-my-solr-server/