I've seen the following errors when changing to Debug on the VMManager: (Ignition 7.6.6, Windows 8.1, Java 7_67). If I try to login 3-4 times it then lets me.
Time Logger Message
(I) 12:58:35 PM Mobile.VMManager New client VM discovered. id=d4dcde0e-2180-776b-a5c0-1ecde60a9fa9
(I) 12:58:34 PM Mobile.VMManager VMCreator starting 1 new client VM(s).
WARN 12:58:33 PM Mobile.DataServlet Failure in mobiledata/initvm
java.net.SocketException: Connection reset by peer: 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$ClientVMImpl.sendMessage(MobileVMManager.java:612)
at com.inductiveautomation.mobile.gateway.MobileVMManager.initializeVM(MobileVMManager.java:338)
at com.inductiveautomation.mobile.gateway.servlets.MobileSession.initializeVM(MobileSession.java:384)
at com.inductiveautomation.mobile.gateway.servlets.MobileDataServlet$InitVM.handle(MobileDataServlet.java:835)
at com.inductiveautomation.mobile.gateway.servlets.MobileDataServlet.doRequest(MobileDataServlet.java:159)
at com.inductiveautomation.mobile.gateway.servlets.MobileDataServlet.doGet(MobileDataServlet.java:108)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at com.inductiveautomation.ignition.gateway.bootstrap.MapServlet.service(MapServlet.java:85)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Unknown Source)
(I) 12:58:33 PM Mobile.ClientVM Client vm 4188d323-9ce7-8fae-7eb2-890d04d6f442 closed: Exception during init message
WARN 12:58:24 PM Mobile.DataServlet.RectsB64 Failure in mobiledata/rects. [isClientVMRunning()=false, VM.id=77d4e664-2d71-3c71-2af5-3df5680cba96
java.net.SocketException: Connection reset by peer: 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$ClientVMImpl.getDirtyRectangles(MobileVMManager.java:499)
at com.inductiveautomation.mobile.gateway.servlets.MobileSession.getDirtyRectangles(MobileSession.java:263)
at com.inductiveautomation.mobile.gateway.servlets.MobileDataServlet$RectsBase64.handle(MobileDataServlet.java:304)
at com.inductiveautomation.mobile.gateway.servlets.MobileDataServlet.doRequest(MobileDataServlet.java:159)
at com.inductiveautomation.mobile.gateway.servlets.MobileDataServlet.doGet(MobileDataServlet.java:108)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at com.inductiveautomation.ignition.gateway.bootstrap.MapServlet.service(MapServlet.java:85)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Unknown Source)
(I) 12:58:24 PM Mobile.ClientVM Client vm 77d4e664-2d71-3c71-2af5-3df5680cba96 closed: IOException during rectangle message: java.net.SocketException: Connection reset by peer: socket write error
Any insight on this?