When trying to connect to SharePoint, Sharegate displays the following error:
Proxy authentication is required in order to connect to your SharePoint site. Please specify the proxy information under "Advanced authentication".
|Any error code ending with: -159|
This error occurs when you are using a proxy to connect to SharePoint and the proxy asks for credentials, but those credentials were not set in Sharegate.
Expand the Advanced Authentication section to specify the proxy settings, including the credentials to use.