Problems in authentication
1. Error in authentication
Type your username and password:
2. Slow Internet connection
If your Internet connection is slow or unstable, it might cause authentication error as a result of time out. Check your Internet connection.
3. Losing connection
Once you've logged in, every new URL that opens will begin with: https:///
If a new window opens without it, it's a sign you've lost connection to the VPN service.
4. Proxy settings
If you are connected successfully and you can't reach sites with your browser (The problem repeats itself especially when connected behind a router) - try to change your proxy settings.
Reference:
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Cloud Based Firewall
CISCO Firewall