PPP server only allow root to start service

I've set up my linux(RedHat 4.1) as ppp server by add
"s1:2345:respawn:/sbin/mgetty -s 38400 ttyS0" to /etc/inittab and a ppp login script
" exec /usr/sbin/pppd 38400 passive netmask 255.255.255.0 202.x.x.1:202.x.x.2"
I connect to linux using WIN95 dialup network and successfully login to my linux server, but for normal user login and start ppp login script, linux do nothing after start the script. But for root user login, everything is OK.

I suspect that there is some files which can only be accessed by root user. Anyone call tell me how fix it.
raymanAsked:
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unicorntechCommented:
Check the permissions on pppd - try changing it by chmod +x pppd
Let me know how this goes,
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raymanAuthor Commented:
You've forgot what your answer to CHRISTG last time.

I've read from your previously answered question and get the answer
"chmod 4755 /usr/sbin/pppd" (rwsr_xr_x)will fixed this problem, not "chmod 755".
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