Upgraded from 3.0 to 3.1 and now grafana can not connect, i have updated both webui and webapi.
The webapi is active but when you save and test in the grafana connector you get "HTTP Error Internal Server Error"

Can not find any logs that shows a description of the error found it

in the webui logs:

INFO: 2019-12-05	09:21:29	192.168.*.*	admin	192.168.*.*	8083	GET	/webapi/grafana/datacollection
dec 05, 2019 9:21:34 FM org.restlet.resource.ServerResource doCatch
SEVERE: Exception or error caught in server resource
org.restlet.resource.ResourceException: Internal Server Error (500) - The server encountered an unexpected condition which prevented it from fulfilling the request
	at org.restlet.resource.ServerResource.doHandle(ServerResource.java:527)
	at org.restlet.resource.ServerResource.get(ServerResource.java:723)
	at org.restlet.resource.ServerResource.doHandle(ServerResource.java:603)
	at org.restlet.resource.ServerResource.doNegotiatedHandle(ServerResource.java:662)
	at org.restlet.resource.ServerResource.doConditionalHandle(ServerResource.java:348)
	at org.restlet.resource.ServerResource.handle(ServerResource.java:1020)
	at org.restlet.resource.Finder.handle(Finder.java:236)
	at org.restlet.routing.Filter.doHandle(Filter.java:150)
	at org.restlet.routing.Filter.handle(Filter.java:197)
	at org.restlet.routing.Router.doHandle(Router.java:422)
	at org.restlet.routing.Router.handle(Router.java:641)
	at org.restlet.routing.Filter.doHandle(Filter.java:150)
	at org.restlet.routing.Filter.handle(Filter.java:197)
	at org.restlet.routing.Filter.doHandle(Filter.java:150)
	at org.restlet.routing.Filter.handle(Filter.java:197)
	at org.restlet.routing.Filter.doHandle(Filter.java:150)
	at org.restlet.routing.Filter.handle(Filter.java:197)
	at org.restlet.routing.Filter.doHandle(Filter.java:150)
	at org.restlet.engine.application.StatusFilter.doHandle(StatusFilter.java:140)
	at org.restlet.routing.Filter.handle(Filter.java:197)
	at org.restlet.routing.Filter.doHandle(Filter.java:150)
	at org.restlet.routing.Filter.handle(Filter.java:197)
	at org.restlet.engine.CompositeHelper.handle(CompositeHelper.java:202)
	at org.restlet.engine.application.ApplicationHelper.handle(ApplicationHelper.java:77)
	at org.restlet.Application.handle(Application.java:385)
	at org.restlet.routing.Filter.doHandle(Filter.java:150)
	at org.restlet.routing.Filter.handle(Filter.java:197)
	at org.restlet.routing.Router.doHandle(Router.java:422)
	at org.restlet.routing.Router.handle(Router.java:641)
	at org.restlet.routing.Filter.doHandle(Filter.java:150)
	at org.restlet.routing.Filter.handle(Filter.java:197)
	at org.restlet.routing.Router.doHandle(Router.java:422)
	at org.restlet.routing.Router.handle(Router.java:641)
	at org.restlet.routing.Filter.doHandle(Filter.java:150)
	at org.restlet.routing.Filter.handle(Filter.java:197)
	at org.restlet.engine.CompositeHelper.handle(CompositeHelper.java:202)
	at org.restlet.Component.handle(Component.java:408)
	at org.restlet.Server.handle(Server.java:507)
	at org.restlet.engine.connector.ServerHelper.handle(ServerHelper.java:63)
	at org.restlet.engine.adapter.HttpServerHelper.handle(HttpServerHelper.java:143)
	at org.restlet.ext.servlet.ServerServlet.service(ServerServlet.java:1117)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:587)
	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:1127)
	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:1061)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
	at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:215)
	at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:110)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
	at org.eclipse.jetty.server.Server.handle(Server.java:499)
	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)
	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
	at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.net.SocketTimeoutException: connect timed out
	at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
	at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85)
	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
	at java.net.Socket.connect(Socket.java:589)
	at org.netxms.client.NXCSession.connect(NXCSession.java:1934)
	at org.netxms.client.NXCSession.connect(NXCSession.java:1907)
	at org.netxms.websvc.handlers.AbstractHandler.login(AbstractHandler.java:402)
	at org.netxms.websvc.handlers.AbstractHandler.attachToSession(AbstractHandler.java:218)
	at org.netxms.websvc.handlers.AbstractHandler.onGet(AbstractHandler.java:77)
	at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.restlet.resource.ServerResource.doHandle(ServerResource.java:511)
	... 61 more

Everything runs on the same server, netxmsd, webui and grafana

Edit:

Downgraded the webapi to "NetXMS web service API version 3.0.2296" then it worked again