Resolution: NetSuite is going to stop supporting Transport Layer Security (TLS) 1.0 and 1.1 and move to TLS 1.2 for web services integration. Support for inbound and outbound connections to NetSuite sandbox accounts using TLS protocol version 1.0 and version 1.1 will end on April 18, 2016. This deprecation will apply to connections to and from the NetSuite user interface and NetSuite web services in the sandbox domain only. TLS deprecation in the production domain is targeted for September 2016.
TLS 1.2 can be configured in TIBCO ActiveMatrix BusinessWorks Plug-in for NetSuite 1.0.0 hotfix5 and TIBCO ActiveMatrix BusinessWorks Plug-in for NetSuite 6.2.0 .
In TIBCO ActiveMatrix BusinessWorks 5.x environment, set 'java.property.https.protocols=TLSv1.2' in the .tra file, such as designer.tra.
In TIBCO ActiveMatrix BusinessWorks 6.x environment, set '-Dhttps.protocols=TLSv1.2' in debug windows of 'Arguments' tab -> 'VM arguments'.