CONNECTION FAILED AFTER 4 ATTEMPTS. ERROR MESSAGE: VALUE CANNOT BE NULL. PARAMETER NAME: URISTRING (version 2)

In QMC > Virtual proxies > Central proxy (Default) > Windows,  authentication pattern: must be Windows.

If you have a different option, please create a new virtual proxy, for example, md, and use this prefix in the field Virtual Proxy Path in the Create Datasource window:

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