Below are some steps to try when troubleshooting a network authentication problem:

1. Check to make sure that your wireless connection is enabled and running
2. Verify that your wireless router is set up properly and connected to the modem.
3. Check your browser settings to make sure they are correct.
4. Verify that the network you are trying to access is correctly configured.
5. Check if the network is functioning and that you have working access to it.
6. Restart your computer and try to reconnect to the network.
7. If the problem persists, contact your network provider for further troubleshooting assistance.