# Troubleshooting AWS Client VPN: Client does not open browser for an endpoint — federated authentication
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**Problem**  
I use federated authentication for my Client VPN endpoint. When clients try to connect to the endpoint, the client software does not open a browser window, and instead displays a user name and password popup window.

**Cause**  
The configuration file that was provided to the clients does not contain the `auth-federate` flag.

**Solution**  
[Export the latest configuration file](cvpn-working-endpoint-export.md), import it to the AWS provided client, and try connecting again.