From what I can tell, something changed in how LWP validates certificates, at least on Linux (the issue doesn't seem to affect Windows). The fix I used was to add the root CA certificate for the Nexpose console to the trusted root certificate store.
For a Ubuntu/Debian based system:
1. Export the root certificate used for the Nexpose console. If you haven't done this before, here is a screenshot to point you in the right direction:
2. Copy the root certificate to the ca-certificates folder on the system hosting the connector: sudo cp nexposeconsoleroot.crt /usr/local/share/ca-certificates/
3. Update the CA store: sudo update-ca-certificates
4. The connector should now work.
If you want to remove the added root certificate: sudo rm /usr/local/share/ca-certificates/nexposeconsoleroot.crt sudo update-ca-certificates --fresh