Juniper Secure Connect is unable to establish connection due to error message: Could not contact Gateway. Please check your internet connection.

Error messages in logs:

1. Validate the connectivity to SRX using ping/traceroute/DNS lookup.
2. Possible wrong name or IP address as tunnel end point.
   1. Check if VPN gateway IP address in the logs is the correct.
3. Tunnel end point can't be reached over IPSec
   1. Validate UDP 500, UDP 4500 and TCP 443 are allowed
4. Take PCAP and Traceoptions to validate behavior of the traffic if configuration is correct.

How to create a PCAP packet capture on a SRX branch device

Example: Configuring traceoptions for logical systems