I have configured a "Generic UDP Proxy"
"Display configured addresses and services" on the server console shows
following:

Configured Services:
Generic UDP Forwarder at TCP/IP address 192.168.181.17:123
for 192.168.183.245:123
** Error ** Listen error 0
Generic UDP Forwarder at TCP/IP address 192.168.181.10:123
for 192.168.183.245:123
** Error ** Listen error 0

On the old BM (NW5, BM3.6SP2) it works. What can I do?

OS: v7.0 Support Pack for NetWare 5.1,
BM: BorderManager 3.6 Support Pack 2A
PROXY.NLM: Version 3.72l
TCPIP.NLM: Version 5.95q