Hello Rakesh,
You are using DB on server A for connection from Server B. This is most often the scenario if there is no database Access on Server B. Most Probably, your remote Hosting Provider is not allowing outward connections to port 3306 or maybe blindly blocked 3306 in the firewall. Outward DB connections cause enormous network traffic and is therefore generally disabled.
Confirm from the other server whether it is allowed or not.
Regds
IJ
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