Description:-
The BusinessConnect (BC) Interior Server (IS) fails to start with ddtp error: 

Error:-
java.lang.RuntimeException: com.tibco.ax.fw.runtime.impl.GtwyException: Data Port error connecting to Gateway Server
    at com.tibco.ax.fw.runtime.inbound.impl.IBMSHService$FetchFileThread.doUnitOfWork(IBMSHService.java:2574)
    at com.tibco.ax.fw.runtime.impl.AbstractService$MessageCallbackThread.run(AbstractService.java:1419)
    at com.tibco.pe.util.ThreadPool$ThreadPoolThread.run(Unknown Source)
Caused by: com.tibco.ax.fw.runtime.impl.GtwyException: Data Port error connecting to Gateway Server
    at com.tibco.ax.fw.runtime.inbound.impl.IBMSHService$FetchFileThread.doUnitOfWork(IBMSHService.java:2572)
    ... 2 more
Caused by: java.lang.IllegalStateException: Scheme 'https' not registered.
    at org.apache.http.conn.scheme.SchemeRegistry.getScheme(SchemeRegistry.java:71)
    at org.apache.http.impl.conn.DefaultHttpRoutePlanner.determineRoute(DefaultHttpRoutePlanner.java:111)
    at org.apache.http.impl.client.DefaultRequestDirector.determineRoute(DefaultRequestDirector.java:709)
    at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:356)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:820)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:754)
    at com.tibco.ax.fw.webengine.client.WebClient.perform(WebClient.java:275)
    at com.tibco.ax.fw.runtime.inbound.impl.IBMSHService$FetchFileThread.fetchData(IBMSHService.java:2493)
    at com.tibco.ax.fw.runtime.inbound.impl.IBMSHService$FetchFileThread.doUnitOfWork(IBMSHService.java:2563)
    ... 2 more

The BusinessConnect (BC) Interior Server (IS) fails to start with ddtp error: ddtp server error, details: com.tibco.ax.fw.runtime.impl.GtwyException: Data Port error connecting to Gateway Server

ALL

This error will only occur when using plain HTTP data transfers between the IS and GS, which is enabled by setting "bc.ib.channel.force.plain" property in TIBCO Administrator GUI under 
BusinessConnect > System Settings > Activated Protocol Plug-ins and Properties 
> BC.

This error occurs when the corresponding value "java.property.bc.ib.channel.force.plain" is not set to true in all gsengine.tra files. Correcting this value will resolve the issue.