Hi All,
I'm working on Linux 7.2,Oracle 9i on production box. My users are very frequently getting this error when they are trying to connect from TOAD or SQL*PLUS, or on telnet session. At the same time, at $ prompt, i'm getting core dumped error too. This is my ulimit parameters with their values, please try to help me.

ERROR:ORA-12500: TNS:listener failed to start a dedicated server process

This is from Telnet/Hyperterminal session:
ERROR: Enter user-name: devlcms
Enter password:
ORA-12547: TNS:lost contact

This is my ulimit
core file size (blocks) 1000000
data seg size (kbytes) unlimited
file size (blocks) unlimited
max locked memory (kbytes) unlimited
max memory size (kbytes) unlimited
open files 1024
pipe size (512 bytes) 8
stack size (kbytes) 8192
cpu time (seconds) unlimited
max user processes 136192
virtual memory (kbytes) unlimited

Please suggest me . Your earliest responce is most appreciated.

Thanks in advance