Postgres PHP error

Hi All

Im receiving the following error, on a php page, conneting to postgres 7.4,
installed on Mandrake 10.0 
<snip> 
Error Description: pg_connect(): Unable to connect to PostgreSQL server:
FATAL: sorry, too many clients already .  
</snip> 
Can anyone tell me what this means? 
Is there a performance setting I need to set under the postgresql conf file. 
I have checked, and its set to 100 users. 
This error strangely has only happened once. Last week Monday.

Kind Regards, 



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