Please see below logs.
4:00:42 PM RectsB64 Failure in mobiledata/rects. [isClientVMRunning()=false, VM.id=8e6501b7-b029-d8d1-ca41-6cc673ee29fa
java.net.SocketException: Software caused connection abort: socket write error
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(Unknown Source)
at java.net.SocketOutputStream.write(Unknown Source)
at java.io.BufferedOutputStream.flushBuffer(Unknown Source)
at java.io.BufferedOutputStream.flush(Unknown Source)
at java.io.DataOutputStream.flush(Unknown Source)
at com.inductiveautomation.mobile.gateway.MobileVMManager$ClientVMImpl.getDirtyRectangles(MobileVMManager.java:493)
at com.inductiveautomation.mobile.gateway.servlets.MobileSession.getDirtyRectangles(MobileSession.java:323)
at com.inductiveautomation.mobile.gateway.servlets.MobileDataServlet$RectsBase64.handle(MobileDataServlet.java:327)
at com.inductiveautomation.mobile.gateway.servlets.MobileDataServlet.doRequest(MobileDataServlet.java:182)
at com.inductiveautomation.mobile.gateway.servlets.MobileDataServlet.doGet(MobileDataServlet.java:131)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at com.inductiveautomation.ignition.gateway.bootstrap.MapServlet.service(MapServlet.java:85)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:769)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1125)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1059)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:52)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
at org.eclipse.jetty.server.Server.handle(Server.java:497)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:248)
at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:540)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:610)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:539)
at java.lang.Thread.run(Unknown Source)
less
(I) 4:00:42 PM ClientVM Client vm 8e6501b7-b029-d8d1-ca41-6cc673ee29fa closed: IOException during rectangle message: java.net.SocketException: Software caused connection abort: socket write error
(I) 4:00:42 PM VMManager New client VM discovered. id=8e6501b7-b029-d8d1-ca41-6cc673ee29fa
(I) 4:00:41 PM VMManager VMCreator starting 1 new client VM(s).
4:00:39 PM RectsB64 Failure in mobiledata/rects.
javax.servlet.ServletException: Session not initialized.
at com.inductiveautomation.mobile.gateway.servlets.MobileDataServlet.getSession(MobileDataServlet.java:588)
at com.inductiveautomation.mobile.gateway.servlets.MobileDataServlet.getSession(MobileDataServlet.java:571)
at com.inductiveautomation.mobile.gateway.servlets.MobileDataServlet$RectsBase64.handle(MobileDataServlet.java:325)
at com.inductiveautomation.mobile.gateway.servlets.MobileDataServlet.doRequest(MobileDataServlet.java:182)
at com.inductiveautomation.mobile.gateway.servlets.MobileDataServlet.doGet(MobileDataServlet.java:131)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at com.inductiveautomation.ignition.gateway.bootstrap.MapServlet.service(MapServlet.java:85)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:769)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1125)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1059)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:52)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
at org.eclipse.jetty.server.Server.handle(Server.java:497)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:248)
at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:540)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:610)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:539)
at java.lang.Thread.run(Unknown Source)