thanx for the response stephane. i had enabled the logging too but the trace file doesnt seem to contain any error however i am pasting the contents of the file for the sake of ref. I might be missing somewhere: trace file contents: **************************************************************************** nscon: sending NSPTRF packet ntnwr: failed to write 115 bytes ntn2err: error: handle=428, op=6, nt[0]=524, nt[1]=997 ntnrd: failed to read 2064 bytes ntn2err: error: handle=428, op=5, nt[0]=507, nt[1]=109 nserror: nsres: id=6, op=68, ns=12537, ns2=12560; nt[0]=507, nt[1]=109, nt[2]=0; ora[0]=0, ora[1]=0, ora[2]=0 nstimarmed: no timer allocated nsclose: closing transport nsclose: global context check-out (from slot 6) complete nsopen: opening transport... nttcnp: getting sockname nttcnr: waiting to accept a connection. nttcnr: getting sockname nttcnr: connected on ipaddr 192.9.200.16 <http://192.9.200.16> nttvlser: valid node check on incoming node 192.9.200.16<http://192.9.200.16> nttvlser: Accepted Entry: 192.9.200.16 <http://192.9.200.16> nttcon: set TCP_NODELAY on 428 nserror: nsres: id=2, op=78, ns=12612, ns2=0; nt[0]=0, nt[1]=0, nt[2]=0; ora[0]=0, ora[1]=0, ora[2]=0 nsopen: transport is open nsnainit: inf->nsinfflg[0]: 0xd inf->nsinfflg[1]: 0xd nsopen: global context check-in (to slot 6) complete nsanswer: deferring connect attempt; at stage 5 ntt2err: soc 428 error - operation=5, ntresnt[0]=524, ntresnt[1]=997, ntresnt[2]=0 nscon: doing connect handshake... nscon: got NSPTCN packet nsevdansw: exit nttgetport: port resolved to 1109 nttbnd2addr: looking up IP addr for host: ns1.oneapps.com<http://ns1.oneapps.com> nscall: connecting... nttgetport: port resolved to 1109 nttbnd2addr: looking up IP addr for host: ns1.oneapps.com<http://ns1.oneapps.com> nsopen: opening transport... nttcni: trying to connect to socket 444. nttcni: connected on ipaddr 0.0.0.0 <http://0.0.0.0> nttcon: set TCP_NODELAY on 444 nsopen: transport is open nsopen: global context check-in (to slot 7) complete nscall: deferring connect attempt; at stage 4 nscon: doing connect handshake... nscon: sending NSPTCN packet ntt2err: soc 444 error - operation=5, ntresnt[0]=524, ntresnt[1]=997, ntresnt[2]=0 nsevdcall: exit nscon: got NSPTAC packet nscon: doing connect handshake... nscon: nsctxinf[0]=0x61, [1]=0x0 nstimarmed: no timer allocated nsclose: closing transport nsclose: global context check-out (from slot 7) complete nscall: connecting... nttgetport: port resolved to 1336 nttbnd2addr: looking up IP addr for host: ns1.oneapps.com<http://ns1.oneapps.com> nsopen: opening transport... nttcni: trying to connect to socket 464. nttcni: connected on ipaddr 0.0.0.0 <http://0.0.0.0> nttcon: set TCP_NODELAY on 464 nsopen: transport is open nsopen: global context check-in (to slot 7) complete nscall: deferring connect attempt; at stage 8 nsevdcall: exit nsbequeath: NSE=0 nstimarmed: no timer allocated nsclose: closing transport nsclose: global context check-out (from slot 6) complete nsevdansw: exit nsglhe: Deallocating cxd 0xed0370. nsopen: opening transport... nttcnp: getting sockname nttcnr: waiting to accept a connection. nttcnr: getting sockname nttcnr: connected on ipaddr 192.9.200.16 <http://192.9.200.16> nttvlser: valid node check on incoming node 192.9.200.169<http://192.9.200.169> nttvlser: Accepted Entry: 192.9.200.169 <http://192.9.200.169> nttcon: set TCP_NODELAY on 428 nserror: nsres: id=2, op=78, ns=12612, ns2=0; nt[0]=0, nt[1]=0, nt[2]=0; ora[0]=0, ora[1]=0, ora[2]=0 nsopen: transport is open nsnainit: inf->nsinfflg[0]: 0xd inf->nsinfflg[1]: 0xd nsopen: global context check-in (to slot 6) complete nsanswer: deferring connect attempt; at stage 5 ntt2err: soc 428 error - operation=5, ntresnt[0]=524, ntresnt[1]=997, ntresnt[2]=0 nscon: doing connect handshake... nscon: got NSPTCN packet nsevdansw: exit nttgetport: port resolved to 1109 nttbnd2addr: looking up IP addr for host: ns1.oneapps.com<http://ns1.oneapps.com> nsbequeath: NSE=0 nstimarmed: no timer allocated nsclose: closing transport nsclose: global context check-out (from slot 6) complete nsevdansw: exit nsglhe: Deallocating cxd 0xed0370. nsopen: opening transport... nttcnp: getting sockname nttcnr: waiting to accept a connection. nttcnr: getting sockname nttcnr: connected on ipaddr 192.9.200.16 <http://192.9.200.16> nttvlser: valid node check on incoming node 192.9.200.169<http://192.9.200.169> nttvlser: Accepted Entry: 192.9.200.169 <http://192.9.200.169> nttcon: set TCP_NODELAY on 428 nserror: nsres: id=2, op=78, ns=12612, ns2=0; nt[0]=0, nt[1]=0, nt[2]=0; ora[0]=0, ora[1]=0, ora[2]=0 nsopen: transport is open nsnainit: inf->nsinfflg[0]: 0xd inf->nsinfflg[1]: 0xd nsopen: global context check-in (to slot 6) complete nsanswer: deferring connect attempt; at stage 5 nscon: doing connect handshake... nscon: got NSPTCN packet nsevdansw: exit nttgetport: port resolved to 1109 nttbnd2addr: looking up IP addr for host: ns1.oneapps.com<http://ns1.oneapps.com> nsbequeath: NSE=0 nstimarmed: no timer allocated nsclose: closing transport nsclose: global context check-out (from slot 6) complete nsevdansw: exit nsglhe: Deallocating cxd 0xed0370. nsopen: opening transport... nttcnp: getting sockname nttcnr: waiting to accept a connection. nttcnr: getting sockname nttcnr: connected on ipaddr 192.9.200.16 <http://192.9.200.16> nttvlser: valid node check on incoming node 192.9.200.16<http://192.9.200.16> nttvlser: Accepted Entry: 192.9.200.16 <http://192.9.200.16> nttcon: set TCP_NODELAY on 428 nserror: nsres: id=2, op=78, ns=12612, ns2=0; nt[0]=0, nt[1]=0, nt[2]=0; ora[0]=0, ora[1]=0, ora[2]=0 nsopen: transport is open nsnainit: inf->nsinfflg[0]: 0xd inf->nsinfflg[1]: 0xd nsopen: global context check-in (to slot 6) complete nsanswer: deferring connect attempt; at stage 5 nscon: doing connect handshake... nscon: got NSPTCN packet nsevdansw: exit nttgetport: port resolved to 1109 nttbnd2addr: looking up IP addr for host: ns1.oneapps.com<http://ns1.oneapps.com> nsbequeath: NSE=0 nstimarmed: no timer allocated nsclose: closing transport nsclose: global context check-out (from slot 6) complete nsevdansw: exit nsglhe: Deallocating cxd 0xed0370. nsopen: opening transport... nserror: nsres: id=0, op=78, ns=12612, ns2=0; nt[0]=0, nt[1]=0, nt[2]=0; ora[0]=0, ora[1]=0, ora[2]=0 nsopen: transport is open nsnainit: inf->nsinfflg[0]: 0xd inf->nsinfflg[1]: 0xd nsopen: global context check-in (to slot 6) complete nsanswer: deferring connect attempt; at stage 5 ntnrd: failed to read 8208 bytes ntn2err: error: handle=224, op=5, nt[0]=524, nt[1]=997 nscon: doing connect handshake... nscon: got NSPTCN packet nsevdansw: exit nscon: sending NSPTRF packet ntnwr: failed to write 115 bytes ntn2err: error: handle=224, op=6, nt[0]=524, nt[1]=997 ntnrd: failed to read 2064 bytes ntn2err: error: handle=224, op=5, nt[0]=507, nt[1]=109 nserror: nsres: id=6, op=68, ns=12537, ns2=12560; nt[0]=507, nt[1]=109, nt[2]=0; ora[0]=0, ora[1]=0, ora[2]=0 nstimarmed: no timer allocated nsclose: closing transport nsclose: global context check-out (from slot 6) complete nsopen: opening transport... nserror: nsres: id=0, op=78, ns=12612, ns2=0; nt[0]=0, nt[1]=0, nt[2]=0; ora[0]=0, ora[1]=0, ora[2]=0 nsopen: transport is open nsnainit: inf->nsinfflg[0]: 0xd inf->nsinfflg[1]: 0xd nsopen: global context check-in (to slot 6) complete nsanswer: deferring connect attempt; at stage 5 ntnrd: failed to read 8208 bytes ntn2err: error: handle=464, op=5, nt[0]=524, nt[1]=997 nscon: doing connect handshake... nscon: got NSPTCN packet nsevdansw: exit **************************************************************************************** any clue?????????????????????????????? On 11/9/05, Stephane Faroult <sfaroult@xxxxxxxxxxxx> wrote: > > Enable logging and check what you get. It may be something not obviously > related to Oracle (permissions, etc.). > > SF > > On Wed, 2005-11-09 at 17:50 +0530, Onkar N Tiwary wrote: > > Hi guys, > > > > Since today morning I am facing one problem : > > > > ORA-12547 : TNS lost contact > > > > > > -- Thanks & Regards, T. Onkar Nath OneAPPS Enterprise Technology Pvt. Ltd. to_onkar@xxxxxxxxx onkarnath.tiwary@xxxxxxxxx