BOBJ Data Federator Driver Connection to server lost

Hello, Guru's,

We are on "SAP BusinessObjects BI Platform 4.2 Support Pack 7 Patch 1" when we are running a report, we face different types of errors.
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1. The Following database error occurred: [Data federator Driver] cannot reach server. Reason: attempt to establish connection failed: java.net.ConnectException: Connection refused: connect (local port 51968 to address 0:0:0:0:0:0:0:0, remote port 51535 to address fe80:0:0:0:fc1e:af6f:be88:8c31(SERVER.af.lan)).

2. The Following database error occurred: [Data federator Driver] Connection to server lost: Reason: recv() failed:I/O error during read: java.net.SocketException: Connection reset.

Please find the attached Error screenshots.

Thanks
Praveen