[Users] Problem in Load Balancing with 2 openSER proxies Server..

Hi Users Am doing the Load-balance. I Have to 2 openser sip proxies Server with Different IP The Sip domain is napped the two ip's of the OPENSER Proxies This for failure and load-balancing of the SIP proxies When AM testing Two UAC's are Register in one the SIP proxy-A . When the call is Established , I Stop the First SIP proxy-A , and Stared the Second SipProxy-B , Call flow is fine for the UAC and UAS 's also but in Debug mode of second proxy-B is seen the Follow ing Error. ERROR: udp_send: sendto(sock,0x20b6bc,4,0,0xbfe13840,16): Bad file descriptor(9) 1(19010) ERROR: udp_send: sendto(sock,0x78e1d8,4,0,0xbfe13790,16): Bad file descriptor(9) 1(19010) ERROR:nathelper:nh_timer: udp udp_send failed 1(19010) ERROR: udp_send: sendto(sock,0x78e1d8,4,0,0xbfe13790,16): Bad file descriptor(9) 1(19010) ERROR:nathelper:nh_timer: udp udp_send failed PLease any one help me............ ! -- Thanks &Regards Ravi Prakash Sunkara