netweaver 7.0s "Cannot reach external Application Server on localhost:50000

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i entered SOAMANAGER(T-CODE) at SAP-GUI.

only thing i set for this is "J2EE Server Access Information"

at System Global Settings in soamanager web page.

Hostname and Portnumber is entered normally.

and

when i click [Open Web Service navigator for selected binding]

at Business Administration tap

to test a simple web servcie that i made in SAP-GUI(it's made very simply by wizard.).

"503 Service not available" page popup.

the others link in soamanager page is operating normally.

but only [Open Web Service navigator for selected binding] has

the problem.

plz help me.

i'm very new to SAP system.

how i can do at this time?

error detaile :

503 Service not available

-

Error: -6

Version: 7000

Component: J2EE Server

Date/Time: Mon Mar 24 12:59:03 2008

Module: http_j2ee_mt.c

Line: 820

Server: v440-a_SSD_00

Error Tag:

Detail: Cannot reach external Application Server on localhost:50000

thx in advance.