Javascript Adapter throwing java.net.SocketException: Connection reset - https

I am trying to make a https call to the backend server that gives a json data , i could get the by making https calls using browser but when make the same call using the javascript adapter i getting this output
I followed this IBM Knowledge Center to add the cert to the default mobilefirst keystore. I am not sure why i am getting this error?
[ERROR ] FWLSE0099E: An error occurred while invoking procedure [project kmf]login/HttpRequestFWLSE0100E: parameters: [project kmf]
Http request failed: java.net.SocketException: Connection reset
FWLSE0101E: Caused by: [project kmf]java.net.SocketException: Connection resetjava.lang.RuntimeException: Http request failed: java.net.SocketException: Connection reset
at com.worklight.adapters.http.HTTPConnectionManager.execute(HTTPConnectionManager.java:271)
at com.worklight.adapters.http.HttpClientContext.doExecute(HttpClientContext.java:201)
at com.worklight.adapters.http.HttpClientContext.execute(HttpClientContext.java:185

From the comments, by Vivin:
Connection reset means , the backend server has reset the connection. You should consult your network team/ backend team and verify why this occuring. Firewalls / network issues / backend server connection issues are all possibilities. MobileFirst server is only reporting the issue as it found

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How to replication Connection reset by peer in Spring boot?

In my production environment I got the following error in my server:
Cannot forward to error page for request [/api/validation] as the response has already been committed. As a result, the response may have the wrong status code. If your application is running on WebSphere Application Server you may be able to resolve this problem by setting com.ibm.ws.webcontainer.invokeFlushAfterService to false
org.apache.catalina.connector.ClientAbortException: java.io.IOException: Connection reset by peer
Now I created a client and produced 1000 thread every second to call this [/api/validation].
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Exception in thread "Thread-9954" org.springframework.web.client.ResourceAccessException: I/O error on POST request for "http://localhost:7080/v1/name/validate": Timeout waiting for connection from pool; nested exception is org.apache.http.conn.ConnectionPoolTimeoutException: Timeout waiting for connection from pool.
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According to what I know is this error occurs when the client aborts the connection by sending the RST packet.
I set the socket Timeout of my client's rest template to 9000. I make the server sleep for about 15000 MS. Now shouldn't the server get Connection reset by peer as the server tries to send the response after 15 seconds and my client just waits for about 9 seconds. Shouldn't I get the error?
Also in the production environment the wait time (Rest template socket time out) for the client is set to about a 90 seconds ( more than the time the server requires to response). Why is the error being produced in the production?

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Exception while waiting for error code: javax.net.ssl.SSLException: Connection has been shutdown: javax.net.ssl.SSLException: java.net.SocketException: Connection reset
Why I got this exception and how to avoid this issue?
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Error :org.apache.http.conn.HttpHostConnectException: Connection to 132.186.197.59:1003 refused at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:190)at org.apache.http.impl.conn.ManagedClientConnectionImpl.open(ManagedClientConnectionImpl.java:294)
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