pg_connect(): Cannot create new link. Too many open links (0)

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POSTGRESQL BUG REPORT TEMPLATE
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Your name : Mauro Folcarelli
Your email address : mauro(dot)folcarelli(at)sistinf(dot)it

System Configuration
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Architecture : AMD Duron

Operating System : 2.4.22-1.2115.nptl
(From Fedora Core 1)

PostgreSQL version : PostgreSQL-7.3.4-2 and
PostgreSQL-7.3.4-11

PHP version : 4.3.3-6 and
: 4.3.4-1.1

Compiler used : (gcc is 3.3.2-1, but I didn't
compile anything)

Please enter a FULL description of your problem:
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I migrated from (postgresql-7.3.2-3 and php-4.2.2-17) to
(postgresql-7.3.4-2 and php-4.3.3-6).

When I connect to the Database via php, I get the following message
(and the connection aborts):

Warning: pg_connect(): Cannot create new link. Too many open links (0).

I didn't change any configuration file: everything used to work.
It's the first connection to the database
(max connections should be 32 by default, not 0!).

Please describe a way to repeat the problem. Please try to provide a
concise reproducible example, if at all possible:
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If you know how this problem might be fixed, list the solution below:
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May be it has already been fixed in a PostgreSQL release > 7.3.4-11
or a php-pgsql release > 4.3.4-1.1 ?

Thanks a lot.
Mauro