Unable to Configure RQM to comsume the DOORS as OSLC provider

I am trying to follow this article, but getting following error during "Configure RQM to consume OSLC Data -> Configure RQM to comsume the DOORS provider "

An error occurred while requesting an OAuth consumer key from server "https://dwaserver:9444/dwa/public/rootservices".ID CRJAZ1578E
show details

A networking error occurred while requesting a provisional OAuth consumer key from the "http:/mydwasserver:9444/dwa/oauth/request-consumer-key" URL. See the nested exception for more details.ID CRJAZ1339E
com.ibm.team.repository.common.TeamRepositoryException
com.ibm.team.repository.service.internal.oauth.OAuthRestService.postRequestRemoteProvisionalKey(OAuthRestService.java:198)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
java.lang.reflect.Method.invoke(Method.java:611)
org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.invoke(ExportProxyServiceRecord.java:361)
org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.access$0(ExportProxyServiceRecord.java:347)
org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord$ExportedServiceInvocationHandler.invoke(ExportProxyServiceRecord.java:56)
$Proxy606.postRequestRemoteProvisionalKey(Unknown Source)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
java.lang.reflect.Method.invoke(Method.java:611)
com.ibm.team.repository.servlet.AbstractTeamServerServlet.doModelledRestService(AbstractTeamServerServlet.java:541)
com.ibm.team.repository.servlet.AbstractTeamServerServlet.handleRequest2(AbstractTeamServerServlet.java:2104)
com.ibm.team.repository.servlet.AbstractTeamServerServlet.handleRequest(AbstractTeamServerServlet.java:1924)
com.ibm.team.repository.servlet.AbstractTeamServerServlet.service(AbstractTeamServerServlet.java:1800)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.eclipse.equinox.http.registry.internal.ServletManager$ServletWrapper.service(ServletManager.java:180)
org.eclipse.equinox.http.servlet.internal.ServletRegistration.service(ServletRegistration.java:61)
org.eclipse.equinox.http.servlet.internal.ProxyServlet.processAlias(ProxyServlet.java:126)
org.eclipse.equinox.http.servlet.internal.ProxyServlet.service(ProxyServlet.java:76)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.eclipse.equinox.servletbridge.BridgeServlet.service(BridgeServlet.java:120)
com.ibm.team.repository.server.servletbridge.JazzServlet.service(JazzServlet.java:68)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
com.ibm.team.repository.server.servletbridge.BridgeFilter.processDelegate(BridgeFilter.java:133)
com.ibm.team.repository.server.servletbridge.BridgeFilter.doFilter(BridgeFilter.java:154)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:581)
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:336)
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987)
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:309)
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:897)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:919)
java.lang.Thread.run(Thread.java:738)
Caused by:
org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:822)
org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:754)
org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:732)
com.ibm.team.repository.service.internal.oauth.OAuthRestService.postRequestRemoteProvisionalKey(OAuthRestService.java:173)
... 45 more.
Caused by:
The server failed to respond with a valid HTTP response (org.apache.http.ProtocolException)
org.apache.http.impl.conn.DefaultResponseParser.parseHead(DefaultResponseParser.java:109)
org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:252)
org.apache.http.impl.AbstractHttpClientConnection.receiveResponseHeader(AbstractHttpClientConnection.java:281)
org.apache.http.impl.conn.DefaultClientConnection.receiveResponseHeader(DefaultClientConnection.java:247)
... 54 more.