Can't Connect to License Server (-15,3002)

When we visit our one test env RAM server, it always report the error : Can't Connect to License Server (-15,3002) .
But, when we do configuration on the RAM setup, its test license is no problem. This problem only occur when we begin with visit RAM UI.
Also, all the env access that license server is no problem which mean license server works well.

We got following exception in RAM log:
00000042 SystemOut O CRRAM0004E 6073212 ERROR web com.ibm.ram.repository.security.SecurityManager - Can't get a license for this server. License server error.
com.macrovision.flexlm.FlexlmException: Can't Connect to License Server (-15,3002)
at com.macrovision.flexlm.licsource.LicenseServer.connect(LicenseServer.java:628)
at com.macrovision.flexlm.licsource.LicenseServer.sendMessage(LicenseServer.java:2175)
at com.macrovision.flexlm.licsource.LicenseServer.tryCheckout(LicenseServer.java:991)
at com.macrovision.flexlm.licsource.LicenseServer.checkout(LicenseServer.java:934)
at com.macrovision.flexlm.License.reconnect(License.java:323)
at com.macrovision.flexlm.License.checkout(License.java:283)
at com.ibm.ram.license.LicenseManager.checkout(LicenseManager.java:914)
at com.ibm.ram.license.LicenseManager.initialize(LicenseManager.java:632)
at com.ibm.ram.license.LicenseManager.refreshLicenseManager(LicenseManager.java:757)
at com.ibm.ram.repository.security.SecurityManager.refreshLicenseManagerIfNecessary(SecurityManager.java:1905)
at pagecode.error.ErrorConfiguration.doRetry(ErrorConfiguration.java:54)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:79)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:618)
at com.sun.faces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:127)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:73)
at javax.faces.component.UICommand.broadcast(UICommand.java:312)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:302)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:419)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:77)
at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:220)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:91)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:197)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1152)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1087)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:145)
at com.ibm.ram.repository.web.security.RAMServletFilter.doFilter(RAMServletFilter.java:418)
at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:190)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:130)
at com.ibm.ram.repository.web.filters.GZipFilter.doFilter(GZipFilter.java:42)
at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:190)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:130)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain._doFilter(WebAppFilterChain.java:87)
at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:837)
at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:680)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:588)
at com.ibm.ws.wswebcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:524)
at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:90)
at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:751)
at com.ibm.ws.wswebcontainer.WebContainer.handleRequest(WebContainer.java:1478)
at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:125)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:458)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(HttpInboundLink.java:387)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:267)
at com.ibm.ws.ssl.channel.impl.SSLConnectionLink.determineNextChannel(SSLConnectionLink.java:1037)
at com.ibm.ws.ssl.channel.impl.SSLConnectionLink.readyInboundPostHandshake(SSLConnectionLink.java:725)
at com.ibm.ws.ssl.channel.impl.SSLConnectionLink$MyHandshakeCompletedCallback.complete(SSLConnectionLink.java:412)
at com.ibm.ws.ssl.channel.impl.SSLUtils.handleHandshake(SSLUtils.java:869)
at com.ibm.ws.ssl.channel.impl.SSLHandshakeIOCallback.complete(SSLHandshakeIOCallback.java:70)
at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165)
at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:136)
at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:196)
at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:751)
at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:881)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1497)


Our RAM version is 7202