> I don't have any disconnect call in my code.
Is this the same for all your connections code, apart from your LDAP? It's
good practice to never assume that PHP will disconnect connections for you -
explicitly call the disconnect function when your connection is done with.
> Lately I have noticed that the apache server will get into a state where
> connection requests will occasionally fail. When I refresh the page, the
> connection almost always succeeds on the 2nd attempt. If I restart the
> apache server, the problem totally goes away for a long period of time.
Are you talking about the connection to Apache or the connection from your
Apache server to your other servers?
> So I assume that somewhere, something is causing connections to stay opened
> when the script ends, rather than automatically closing them.
As I said above, always explicitly disconnect from any services you connect to
when you're finished.
> This error occurs with other types of network connections that the script
> makes (besides ldap), so it's not an ldap issue.
> How does Apache automatically close connections when the script ends? Is it
> possible that connections are being left opened? Is there any way to debug
> the problem, i.e. to see if connections are left opened in some way?
Run "netstat -an|grep tcp" on the server's console before and after a page
request - if possible prevent all other connections to your Apache server while
you do it.
Connections that remain open will be in the state "ESTABLISHED" - server
processes (e.g. Apache) will be listed as "LISTEN."
If you get an LDAP connection after your page request that wasn't there before
in the ESTABLISHED state, PHP isn't disconnecting.
If any connections are listed as TIME_WAIT, it means the connection was dropped
without the client disconnecting properly - it may be worth running netstat on
your LDAP server as well.
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