I've seen Java errors in 2 instance (both are easily fixable):
The Nexpose Security Console is not initialized. You can verify the Security Console is up and running by logging into it via a web browser.If the user_id, password, site_id in the Nexpos...
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.
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