Virtuoso Open Source not sponging

Virtuoso Open Source version 07.20.3229, on Win64 is unable to sponge HTTP-accessible web documents, generating an error in the process “HTS01: Cannot connect via HTTPS”.

I have noticed this same error in previous versions of VOS.

What is the HTTPS URL you are seeking to sponge? Can it be sponged from our online public sponging service, As I can sponge HTTPS URL from it like:

and I would expect any Virtuoso instance to do likewise if the sponger cartridges VAD is installed …

@hwilliams -

The URL (as seen in the screencap) appears to be –

– and URIBurner had no problem with it –