IPsec unable to connect

[hahahaha221]

hi all, can you help me. im using shrewsoft to connect to my pfsense box. But when i installed untangle server my vpn client unable to connect.
ff error message appears on the vpn client soft. thanks

"negotiation timout occurred
tunnel disabled
detached from key daemon"

[The Predator]

Check at Untangle, must be something block IPSec tunnel to establish