Anmeldung nicht mehr möglich

Hallo,
nachdem das System (Server und Client auf dem gleichen Win10-Laptop) wunderbar gelaufen hat, werde ich jetzt mit der Meldung „Anmeldedaten oder Verbindungsparameter falsch“ abgewiesen, obwohl ich zumindest bewusst nicht geändert habe.
Das Log sieht so aus:
2018-01-11 13:07:44,569 ERROR [com.jdimension.jlawyer.client.LoginDialog] Error connecting to server
java.lang.IllegalStateException: EJBCLIENT000025: No EJB receiver available for handling [appName:j-lawyer-server, moduleName:j-lawyer-server-ejb, distinctName:] combination for invocation context org.jboss.ejb.client.EJBClientInvocationContext@245d5940
at org.jboss.ejb.client.EJBClientContext.requireEJBReceiver(EJBClientContext.java:774)
at org.jboss.ejb.client.ReceiverInterceptor.handleInvocation(ReceiverInterceptor.java:116)
at org.jboss.ejb.client.EJBClientInvocationContext.sendRequest(EJBClientInvocationContext.java:186)
at org.jboss.ejb.client.EJBInvocationHandler.sendRequestWithPossibleRetries(EJBInvocationHandler.java:255)
at org.jboss.ejb.client.EJBInvocationHandler.doInvoke(EJBInvocationHandler.java:200)
at org.jboss.ejb.client.EJBInvocationHandler.doInvoke(EJBInvocationHandler.java:183)
at org.jboss.ejb.client.EJBInvocationHandler.invoke(EJBInvocationHandler.java:146)
at com.sun.proxy.$Proxy2.login(Unknown Source)
at com.jdimension.jlawyer.client.LoginDialog.cmdLoginActionPerformed(LoginDialog.java:413)
at com.jdimension.jlawyer.client.LoginDialog.pwPasswordKeyPressed(LoginDialog.java:340)
at com.jdimension.jlawyer.client.LoginDialog.access$400(LoginDialog.java:37)
at com.jdimension.jlawyer.client.LoginDialog$4.keyPressed(LoginDialog.java:152)
at java.awt.Component.processKeyEvent(Unknown Source)
at javax.swing.JComponent.processKeyEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.KeyboardFocusManager.redispatchEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$500(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

Wenn ich versuche, den Dienstneu zu starten, kommt
„Der Dienst „jlawyer.org-server“ auf „Lokaler Computer“ konnte nicht beendet werden.
Fehler 1053: Der Dienst antwortete nicht rechtzeitig auf die Start- oder Steuerungsanforderung.“

Was kann ich tun?