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Old 04-29-2013, 08:05 AM   #3 (permalink)
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Default Re: UMA connectivity - router change

In order for IPSec to work, the following ports need to be allowed through the firewall in both directions:

(Note: these only need to be configured manually if you do not have the IPSec Passthrough option on your router)

UDP port 500 (Internet Key Exchange or “IKE”)
UDP port 4500 (IPSec/IKE NAT-T)

(reproduced from crackberry forum )
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