I have this very weird problem (at least for me)
I have a UC520 connected to an ASA5510 via Site-to-Site VPN.
I can ping from clients behind UC520 to client behind ASA5510.
I can ping from clients behind ASA5510 to client behind UC520
I can access services (like RDP) from clients behind UC520 to client behind ASA5510
I can't access services (like RDP, HTTP) from clients behind ASA5510 to client behind UC520
Does anyone have a clue where i need to look? I tried to rule out all access list by (temporarily) making a permit ip any any line in these.
I think it must be some kind of NAT issue, but im not sure.
Thanks in advance
You said your UC logs showed nothing when trying to connect to .11 and .12, this means the traffic either never got to the UC at all, got to the UC and was dropped before entering the LAN, or the traffic got to the hosts but was never returned.
Do the internal hosts have other outbound routes defined on them (doubtful but possible), and can you verify the traffic is through the UC outside interface at least?