Connecting problems with iphone after a closed connection with a Mac
Hi!
I have set up 4 ssl vpn with different shared keys. The connection with each Mac via Securitas is working fine. Additinaly I have set up a ssl vpn for an iPhone iOS4. If the SA 540 is rebooted I can connect to the SA with the iphone without any problems, one tine, two times...
But after I had closed a vpn-Mac-connection it is not possible to connect with the iphone again: the shared key is not correct. In this case the iphone tried to connect with its own shared key - a different one to the Mac connection.
So I set all shared keys to the same. After reboot of the SA the connection of the iphone works well. After a running or closed Mac connection the iphone could not connect to the SA: Error: communication with VPN-Server failed.
So it is not possible to connect with an iphone and an ssl client at the same time. The iphone can only make a connection after a long time again.
Has anybody a solution for that issue?
The latest firmware is installed.
Thanks a lot!
Jens
This is a normal behavior when NAT-T is not enabled. Without NAT-T, the firewall cannot PAT ESP packets because there is no port (UDP or TCP) in the packet. Hence, every packet leaving the WAN interface has the same source address and no source port by which the return traffic can be identified and translated back to the inside address. With NAT-T enabled, the packet is encapsulated in UDP before being translated by NAT; therefore, each IPSec host on the inside of the firewall gets a unique PAT'ed source UDP port after the PAT is peformed and before the packet is sent out of the WAN interface; hence, when the return traffic arrives in the WAN interface, the firewall knows which PAT rule to use to send the return traffic back to the host on the inside of the firewall that originated the IPSec VPN connection.
Therefore, with NAT-T disabled, only one host behind a PAT firewall/router can establish an IPSec VPN tunnel to a host on the Internet at one time.
Besides the requirement of having NAT-T enabled for multiple hosts to be able to establish an IPSec VPN tunnel from behind a PAT firewall/router, you should also make sure that there's a firewall rule applied inbound on the WAN interface that allows UDP 4500; otherwise, NAT-T will not work. NAT-T uses UDP 4500 for IKE negotiations. Without NAT-T, IKE uses UDP 500.
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