The Portal Login/Auto-Configure option within Vuforia Studio is designed to help Trial users configure their Studio instance with their assigned Experience Service and ThingMarks.
Corporate networks may block communication to the Vuforia portal or the assigned Experience Service. If you receive any of the below errors, follow our the resolution steps in our Knowledge Base article Vuforia Studio failed connection issues
If a proxy is in use on the network, it must also be configured within Vuforia Studio as Studio does not inherit browser proxy settings. A protocol must be used when defining the proxy URL within Studio. Proxy configuration can be done on the Settings menu option.
The referenced KB article (CS269453) links to a tool that can be used auto-discover network proxies.
With this comment I update you on the location of such tool, which has changed in the meantime.
The new location is: https://github.com/MarkusBernhardt/proxy-vole
Download the JAR with dependencies as referenced there and run it using
java -jar proxy-vole-1.0.5-jar-with-dependencies.jar