Tunnel is up, but why can't I make a data connection?

[hummer3331973]

I'm still in a lost on how to deal with this. I can confirm from the "show crypto isakmp sa" that the tunnel is up but why can't I start the data connection bet 2 sites (L2L VPN, both Cisco routers). I put the portion of "show crypto session detail" and you can see that I'm receiving the 4 packets of the other end and mine is 0? Why can't I reply?



IPSEC FLOW: permit ip 192.168.15.0/255.255.255.0 172.17.3.0/255.255.255.0
Active SAs: 0, origin: crypto map
Inbound: #pkts dec'ed 4 drop 0 life (KB/Sec) 0/0
Outbound: #pkts enc'ed 0 drop 0 life (KB/Sec) 0/0