Mirth Service Not Starting after installing a plugin - mirth

Question

I have an instance of Mirth that will not start every time I install a plugin. Once I install a plugin, the only way that I can get the Mirth Connect service to start again is to manually remove the plugin from the folder. There is nothing that is going into the logs, so I don't really have much to go on as to why this is happening. I have another instance of Mirth that is on identical hardware, version etc. and it takes plugins just fine. Any ideas of what I can try?
Edit Based on Comment Suggestions from Freiheit:
Mirth Connect version is 3.8.1
The plugin is the Cluster Administrator
I believe that Freiheit is correct that this is an issue with my licensing. When I enter my license key and click on the "save" button, I get the following error:
Method failed: HTTP/1.1 500 Internal Server Error
com.mirth.connect.client.core.ClientException: Method failed: HTTP/1.1
500 Internal Server Error at
com.mirth.connect.client.core.ServerConnection.handleResponse(ServerConnection.java:529)
at
com.mirth.connect.client.core.ServerConnection.executeSync(ServerConnection.java:256)
at
com.mirth.connect.client.core.ServerConnection.apply(ServerConnection.java:166)
at
org.glassfish.jersey.client.ClientRuntime.invoke(ClientRuntime.java:255)
at
org.glassfish.jersey.client.JerseyInvocation$3.call(JerseyInvocation.java:722)
at org.glassfish.jersey.internal.Errors.process(Errors.java:315) at
org.glassfish.jersey.internal.Errors.process(Errors.java:297) at
org.glassfish.jersey.internal.Errors.process(Errors.java:228) at
org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:444)
at
org.glassfish.jersey.client.JerseyInvocation.invoke(JerseyInvocation.java:718)
at
org.glassfish.jersey.client.JerseyInvocation$Builder.method(JerseyInvocation.java:459)
at
org.glassfish.jersey.client.proxy.WebResourceFactory.invoke(WebResourceFactory.java:379)
at com.sun.proxy.$Proxy63.updateLicenseType(Unknown Source) at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at
java.lang.reflect.Method.invoke(Unknown Source) at
com.mirth.connect.client.core.Client$2.invoke(Client.java:266) at
com.sun.proxy.$Proxy63.updateLicenseType(Unknown Source) at
com.mirth.connect.plugins.licensemanager.client.b.a(Unknown Source) at
com.mirth.connect.plugins.licensemanager.client.b.doInBackground(Unknown
Source) at javax.swing.SwingWorker$1.call(Unknown Source) at
java.util.concurrent.FutureTask.run(Unknown Source) at
javax.swing.SwingWorker.run(Unknown Source) at
java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at
java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at
java.lang.Thread.run(Unknown Source) Caused by:
java.io.FileNotFoundException: D:\Program Files\Mirth
Connect\conf\mirth.properties (Access is denied) at
java.io.FileOutputStream.open0(Native Method) at
java.io.FileOutputStream.open(Unknown Source) at
java.io.FileOutputStream.(Unknown Source) at
java.io.FileOutputStream.(Unknown Source) at
com.mirth.connect.plugins.licensemanager.server.LicenseManagerServlet.a(Unknown
Source) at
com.mirth.connect.plugins.licensemanager.server.LicenseManagerServlet.updateLicenseType(Unknown
Source) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at
java.lang.reflect.Method.invoke(Unknown Source) at
com.mirth.connect.server.api.providers.MirthResourceInvocationHandlerProvider$1.invoke(MirthResourceInvocationHandlerProvider.java:219)
at
org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:144)
at
org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:161)
at
org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$VoidOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:143)
at
org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:99)
at
org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:389)
at
org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:347)
at
org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:102)
at
org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:326)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271) at
org.glassfish.jersey.internal.Errors$1.call(Errors.java:267) at
org.glassfish.jersey.internal.Errors.process(Errors.java:315) at
org.glassfish.jersey.internal.Errors.process(Errors.java:297) at
org.glassfish.jersey.internal.Errors.process(Errors.java:267) at
org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317)
at
org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:305)
at
org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1154)
at
org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:471)
at
org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:425)
at
org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:383)
at
org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:336)
at
org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:223)
at
org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:864)
at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1655)
at
com.mirth.connect.server.MethodFilter.doFilter(MethodFilter.java:37)
at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
at
com.mirth.connect.server.api.providers.ClickjackingFilter.doFilter(ClickjackingFilter.java:44)
at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
at
com.mirth.connect.server.api.providers.ApiOriginFilter.doFilter(ApiOriginFilter.java:71)
at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
at
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533)
at
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)
at
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595)
at
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)
at
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1253)
at
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)
at
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)
at
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564)
at
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)
at
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1155)
at
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)
at
org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:61)
at
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
at org.eclipse.jetty.server.Server.handle(Server.java:531) at
org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:352) at
org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260)
at
org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:281)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102)
at
org.eclipse.jetty.io.ssl.SslConnection.onFillable(SslConnection.java:291)
at
org.eclipse.jetty.io.ssl.SslConnection$3.succeeded(SslConnection.java:151)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102)
at
org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)
at
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:754)
at
org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:672)
at java.lang.Thread.run(Unknown Source)

Answer 1

So #Freiheit was correct in the comment that this had to do with the licensing mechanism. I was licensed to run on 4 machines, but I had attempted to license one of the machines several times "unsuccessfully".....however, on the nextgen side, the licensing had been successful.
What I ultimately ended up with was this:
License 1: Server A
License 2: Server B
License 3: Server B
License 4: Server B
So even though I had only activated 2 of my 4 licensed machines, I was showing as having used all 4 of my licenses up. Whats worse, is that having duplicate servers listed was the cause of the http 500 error. The fix ended up being that nextgen had to remove all of my licenses, and I had to go back and redo it one server at a time.