dipsae

I have this strange problem on SLES9.Things I did: telnet from a SLES9 (A) machine to SLES9 ( su to root export DISPLAY=A:0.0 When I try to bring up yast2 I get the error y2controlcenter:cannot connect to X server.. This behavior is observed only on SLES 9 machine..I can bring up yast2 fine using Solaris or other SUSE linux and also RED HAT.. Appreciate any help towards this issue. Thanks