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I use Cisco Anyconnect vpn client with my work and recently noticed some issues. It always connects successfully but sometimes I cannot access resources at work even via ip address. It’s about 1 in 4 times that it actually works. My service desk has told me to subscribe to a business policy with Evading Cisco AnyConnect blocking LAN connections – Silent Jul 02, 2019 Cisco AnyConnect VPN with CLI - AventisTech Sep 27, 2018
Jul 02, 2019
The Cisco VPN client is the client side application used to encrypt traffic from an end user's computer to the company network. IPSec is used to encrypt the traffic. When using standard IPSec, IKE is used for the key negotiation and IPSec to encrypt the data. IKE uses UDP port 500 and IPSec uses IP protocol 50, assuming ESP is used. Cisco ASA5500 Change the AnyConnect Port | PeteNetLive KB ID 0000422 . Problem. AnyConnect runs over TCP port 443 (That’s HTTPS/SSL), but if you only have one public IP and need to forward that port to a web server or internal host then you are a bit snookered. You can of course change the port that AnyConnect runs over, so that it’s no longer on TCP port 443.. Why you would NOT want to do this. Cisco AnyConnect Secure Mobility Client - Cisco
The Cisco AnyConnect Secure Mobility Client is a software application for connecting to a VPN that works on various operating systems and hardware configurations. This software application makes it possible for remote resources of another network become accessible as if the user is directly connected to his network, but in a secure way.
Solved: tcp port 443 for anyconnect - Cisco Community This example show configuring DTLS for AnyConnect and it does use port 443. But it is possible to specify a different port. So basically the ports you need to open will reflect choices that you make in configuring AnyConnect. And let me also make the point that DTLS is not a requirement. It is an optional feature (and in my opinion very Firewall Ports to Open for Session Access | Help | Cisco VPN (AnyConnect) Port 443 (TCP and UDP) VPN (Endpoint Router Kit) Port 443 (TCP) IP Phone VPN: Port 443 (UDP) BYOD: Port 5247 (UDP) Data for BYOD: Port 5246 (UDP) Standard HTTPS (dCloud Remote Desktop) Port 443: Standard HTTP: Port 80 TCP and UDP Ports used for the Cisco VPN Client The Cisco VPN client is the client side application used to encrypt traffic from an end user's computer to the company network. IPSec is used to encrypt the traffic. When using standard IPSec, IKE is used for the key negotiation and IPSec to encrypt the data. IKE uses UDP port 500 and IPSec uses IP protocol 50, assuming ESP is used.