AIX 5.1.0.0-05 + DB2 V8 ESE

i create a muti-nodes instance. but when i use "db2start" command , errors occued ,error code is SQL6048N:
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db2inst1:/home/db2inst1>db2start
05-09-2004 17:33:32 0 0 SQL6048N A communication error occurred during
START or STOP DATABASE MANAGER processing.
05-09-2004 17:33:33 1 0 SQL6048N A communication error occurred during
START or STOP DATABASE MANAGER processing.
SQL1032N No start database manager command was issued. SQLSTATE=57019
db2inst1:/home/db2inst1>
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I performed the following steps:

1. vi /home/db2inst1/sqllib/db2nodes.cfg(My server hostname is IBM270)
0 IBM270 0
1 IBM270 1

2. vi /etc/hosts.equiv,add a row
IBM270

3. chmod 600 /etc/hosts.equiv

but i always had the same error . how can i resolve it ? please help me ,thanks

i had solve the problem , but a new problem appeared. KAO!

i found the reason of this problem was i exec "securetcpip" command before. securetcpip command forbidden rsh, rlogin, rcp etc. i solve the problem with the following steps.
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root:
chmod 555 /usr/sbin/rshd
chmod u+s /usr/sbin/rshd
chmod 555 /usr/bin/rlogin
stopsrc -s inetd
startsrc -s inetd
echo "+" >/.rhosts
chmod 600 /.rhosts

db2inst1:
echo "+" >/.rhosts
chmod 600 /.rhosts
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then i can "db2start" the db2 server.

but i fall across a new problem.
when i use "rsh" and "db2_all" command test the rshd process. root can exec exactly,but user "db2inst1" (the nodes owner) cann't exec exactly. how can i solve it , thanks.

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root:/>rsh localhost echo hi
hi
root:/>db2_all echo hi

hi
IBM270: echo hi completed ok

hi
IBM270: echo hi completed ok
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db2inst1:/home/db2inst1>rsh localhost echo hi
rcmd2: socket: The file access permissions do not allow the specified action.
db2inst1:/home/db2inst1>db2_all echo hi

rcmd2: socket: The file access permissions do not allow the specified action.

rcmd2: socket: The file access permissions do not allow the specified action.
db2inst1:/home/db2inst1>
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