We have 2 ACS appliances that are separated by a WAN.
Both appliances are at the same software version and I have replication set up per Cisco's (as well as others') directions.
When I run replication, I get the error "Cannot replicate to 'ciscoacs2' - server not responding".
If I try replication in the other direction, I get the same error.
I can ping both appliances and access the web interface from both subnets.
There is a firewall between them, but I have port 2000 open and I do not see any other deny messages relating to the ACS replication in the firewall logging.
I ran a sniffer on the receiving appliance's port and got the following:
10.127.101.5 10.127.80.63 TCP evb-elm > cisco-sccp [SYN] Seq=0 Win=65535 Len=0 MSS=1380
10.127.101.5 10.127.80.63 TCP evb-elm > cisco-sccp [ACK] Seq=1 Ack=1 Win=65535 Len=0
10.127.80.63 10.127.101.5 TCP cisco-sccp > evb-elm [SYN, ACK] Seq=0 Ack=1 Win=65535 Len=0 MSS=1460
10.127.101.5 10.127.80.63 TCP evb-elm > cisco-sccp [RST] Seq=25 Win=0 Len=0
10.127.80.63 10.127.101.5 TCP [TCP Dup ACK 1515#1] cisco-sccp > evb-elm [ACK] Seq=1 Ack=1 Win=65535 Len=0
Logging on the devices themselves is terrible, so I really have no idea what would be causing replication to fail.