Web server hangs after exceeding number of connection

Hi DBAs,
We are maintaining oracle 9i and webser on solaris.
so, after reaching 800 connection as shown on v$session the webserver hangs and we have to restart the webserver again.
Please help me where i need to check for this.
Regards
Asif

please find the following details :-
We are maintaining one DB server and 4 webserver .
OS Platform (for DB and Webserver)
: Sun Microsystems Inc. SunOS 5.9
Web server : SunONE 6.1
Database Version : Oracle Database 10g Release 10.1.0.2.0 - 64bit
Physical RAM (for DB server) : 8Gb.
Physical RAM (for Web server):4 web server each of 4 GB
Connect descriptor used in webserver to connect to oracle:
We use JDBC connection pooling that comes with the web server(SunONE)
The details of the configuration are:
<JDBCCONNECTIONPOOL name="wbol-pool" datasourceclassname="oracle.jdbc.pool.OracleDataSource" steadypoolsize="8" maxpoolsize="100"
poolresizequantity="2" idletimeout="300" maxwaittime="180000" connectionvalidationrequired="off"
connectionvalidationmethod="auto-commit" validationtablename="" failallconnections="off" transactioniso
lationlevel="read-committed" isolationlevelguaranteed="on">
<PROPERTY name="URL"
value="jdbc:oracle:thin:@{server ip}:1521:wborcle"/>
<PROPERTY name="User" value="username"/>
<PROPERTY name="Password" value="password"/>
</JDBCCONNECTIONPOOL>
Database is running in Shared mode(with 4 dispatchers) but clients are connected through dedicated mode.
max_process = 810
cur_process = 349
in alert.log file i have seen below error :-
Process q000 started up but failed with error = 20
user not able to stablish a connection through sqlplus also when web server hangs .
Hope you can help me to identify the problem based on above information, if any thing else u wanted to know plz let me know..
Asif

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