Unable to open RFC connection. error while installing solution mngr 04s

hi friends,

i am getting following error while installing 04s soultion manager.

please let me know if anyone of you has resolution for this ...

ERROR 2006-11-14 09:08:59
FRF-00007  <b>Unable to open RFC connection</b>.
ERROR 2006-11-14 09:09:00
MUT-03025  <b>Caught ERfcExcept in Modulecall: Connect to SAP gateway failedConnect_PM </b> GWHOST=ps2516, GWSERV=sapgw01, SYSNR=01
ERROR 2006-11-14 09:09:00
FCO-00011  The step runRSWBOINS with step key |NW_Onehost|ind|ind|ind|ind|0|0|NW_Onehost_System|ind|ind|ind|ind|1|0|NW_CI_Instance|ind|ind|ind|ind|11|0|NW_CI_Instance_ABAP_Reports|ind|ind|ind|ind|1|0|runRSWBOINS was executed with status ERROR .