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Network Adapter could not establish the connection via scan listener
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Hi, User is facing below error when trying to c...... Balaji M Aug 27, 2022, 10:09

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Subject: Network Adapter could not establish the connection via scan listener
Author: Balaji M, India
Date: Aug 27, 2022, 10:09, 38 days ago
Os info: Linux x86-64
Oracle info: 12.1.0.2.0
Message: Hi,

User is facing below error when trying to connect the DB from windows server.
Status : Failure -Test failed: IO Error: The Network Adapter could not
establish the connection (CONNECTION_ID=2kPcnr/vSuuJ7l7uXdX3LA==)


Problem category
RAC/Grid Infrastructure/Clusterware (ASM, ACFS,DNFS,DBFS)/Clusterware /
Grid Infrastructure issues


The DB server has 2 nodes. The user is saying he started facing this issue from 24th August.

The issue occurred when datacentre was rebooted.

The user says when he tries to connect the DB thru scan ip thru sql developer
he is facing below error and application is slow as well.
Status : Failure -Test failed: IO Error: The Network Adapter could not
establish the connection (CONNECTION_ID=2kPcnr/vSuuJ7l7uXdX3LA==)

But when he tries to connect the DB thru individual node ip's he is able to connect the DB thru sql developer.

The user also said, he didn't face this issue before 24th of August.

LAN and Firewall teams confirmed there is no issue from their side and there is no loadbalance issue as well.

Could you please suggest from your side.

Regards,
Balaji
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