PHP and Postgresql OK. But the combination does not work together.

Both PHP and Postgresql work.
But the combination of both sometimes does not together.
In particular, the DB connection fails:

Anybody could analyze this phenomenna?
I am using United Colo G.
I wonder that this is due to UCG's poor management of the network

I am serious because the customer told me this is due to my server. But, I do not have enough knowledge on Postgresql.

Any suggestion will be welcome. Thank you.

 

 

 

 

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