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Expected SSH_MSG_KEX_GEX_GROUP

Hello.
OS Linux Ubuntu
Oracle Service Bus (OSB) 12.1.3 Java 1.7
Steps:
1.Create the proxy service for polling files from remote SFTP resource: sftp://mysrv.dev/in
Any properties in Transport Details of proxy service is default.
sftp://mysrv.dev/in is allowed.
2.Run command:
ssh-keyscan mysrv.dev >> /home/user/Oracle/Middleware/Oracle_Home/user_projects/domains/dev_domain/config/osb/transports/sftp/known_hosts
3.New row in known_hosts:
mysrv.dev ssh-rsa AA...
4.Deploy proxy service to OSB.
As result, polling does not work, it has error in a OSB log files:
[APP: Service Bus SFTP Transport Provider] SFTPClientException occured, message is :: Key exchange failed: Expected SSH_MSG_KEX_GEX_GROUP [id=3] [Unknown cause]
[APP: Service Bus SFTP Transport Provider] Error encountered while polling the resource for the service endpoint ProxyService: com.bea.wli.sb.transports.TransportException: Key exchange failed: Expected SSH_MSG_KEX_GEX_GROUP [id=3] [Unknown cause]
Could you please tell me what I should check or fix?