Master is a Microsoft cluster with ip of virtual cluster name being 172.31.46.53 seen in logs below
Client is a windows 2008 machine with single NIC and telnet is working for all nbu ports.
Also there is no error while connecting client when resilient network is disabled..
Bptestbpcd output extract with debug and verbosity enabled :-
____________________________________________
17:48:48.227 [11608.21064] <16> connect_to_service: connect failed STATUS (18) C
ONNECT_FAILED
status: FAILED, (41) ADDR_IN_USE; system: (10049) The requested address
is not valid in its context. ; FROM 172.31.46.53 TO tmbnginf02.tmindia.tatamotor
s.com 172.18.41.9 bpcd VIA nbrntd
17:48:48.227 [11608.21064] <8> vnet_connect_to_bpcd: [vnet_connect.c:279] connec
t_to_service() failed 18 0x12
17:48:48.227 [11608.21064] <2> local_bpcr_connect: Can't connect to client tmbng
inf02.tmindia.tatamotors.com
17:48:48.227 [11608.21064] <2> ConnectToBPCD: bpcd_connect_and_verify(tmbnginf02
.tmindia.tatamotors.com, tmbnginf02.tmindia.tatamotors.com) failed: 25
<16>bptestbpcd main: Function ConnectToBPCD(tmbnginf02.tmindia.tatamotors.com) f
ailed: 25
17:48:48.242 [11608.21064] <16> bptestbpcd main: Function ConnectToBPCD(tmbnginf
02.tmindia.tatamotors.com) failed: 25
<2>bptestbpcd: cannot connect on socket
17:48:48.242 [11608.21064] <2> bptestbpcd: cannot connect on socket
<2>bptestbpcd: EXIT status = 25
17:48:48.242 [11608.21064] <2> bptestbpcd: EXIT status = 25
cannot connect on socket