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Cisco Secure Access Help Network Requirements for Secure Access Secure Access VPN Services

Last updated: Aug 07, 2025

Secure Access VPN Services

Required by Cisco Secure Client deployments with the Virtual Private Network (VPN) module.

The Cisco Secure Client VPN module uses HTTPS to communicate with the Secure Access VPN client head end services. We recommend that you allow all traffic on ports 443 over TCP or UDP, and ports 500/4500 over IPsec (UDP) for the Secure Access VPN domains.


 
The Cisco Secure Client VPN module automatically uses TLS 443/UDP when it senses that 443/UDP is open.

Remote access virtual private network (VPN) head end services.

Domain Port/Protocol
*.vpn.sse.cisco.com 443 TLS (TCP/UDP)
*.vpn.sse.cisco.com 500/4500 IPsec (UDP)