Help with understanding an error.

[larswik]

I am testing the plugin vs a GraphDB endpoint and everything works fine so far (I get my layers on the map). However, when a colleague tries to "Quick add RDF reference" to the same endpoint, he gets this error message:

Can anyone help with interpreting this? Thanks in advance!

[situx]

The error message would suggest that the user's system only supports an outdated version of SSL, maybe SSLv3, at least not a version the GraphDB web server accepts for communication.
https://stackoverflow.com/questions/9963621/python-ssl-wrong-version-number

Regarding the plugin, it only uses underlying libraries to build up a connection to the SPARQL endpoint and defers this error message to the user.

[TallTed]

For future reference, it is usually more helpful to provide the text of error messages as text, rather than as a screenshot.