This is my setup. Server is Ubuntu 10.04 running Amanda Community 3.1.1. The Windows client is Windows 2008 R2 running ZWC-Community 3.1.1 64bit. The backup server is behind a firewall on a private network. The client is on network behind a firewall. The client has setup in DNS to resolve the FQDN of the backup server. I ran "nslookup backupserver.com" on the client and it does resolve correctly. I ran "amcheck -c DailySet" and received an error "ERROR: client.com: Server validation Failed. Please register server with client." I checked the setup on the client and it lists the FQDN of the backup server. Since the backup server is on a private network using the IP does not work either. Are there other setting I need to check to resolve this? Thanks.