Intermittent problems connecting to an OpenText Livelink Enterprise Server

Symptom

Errors like the following error can occur:

class com.venetica.vbr.client.InvalidQueryException COEN0046E: The TestNoProp item class was not found. Ensure that the item class specified is correct and try again.
com.venetica.vbr.client.InvalidQueryException: COEN0046E: The TestNoProp item class was not found. Ensure that the item class specified is correct and try again.
        at com.venetica.vbr.ejb.bridge.livelink.LivelinkBridge.buildQueryString(LivelinkBridge.java:7821)
        at com.venetica.vbr.ejb.bridge.livelink.LivelinkBridge.executeQuery(LivelinkBridge.java:5333)
        at com.venetica.vbr.ejb.bridge.rmibridge.RMIBridgeProxyImpl.executeQuery(RMIBridgeProxyImpl.java:616)
        at sun.reflect.GeneratedMethodAccessor32.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:618)
        at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:317)
        at sun.rmi.transport.Transport$1.run(Transport.java:168)
        at java.security.AccessController.doPrivileged(AccessController.java:274)
        at sun.rmi.transport.Transport.serviceCall(Transport.java:164)
        at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:506)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.handleRequest(TCPTransport.java:838)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:912)
        at java.lang.Thread.run(Thread.java:811)
        at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:263)
        at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:239)
        at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:141)
        at com.venetica.vbr.ejb.bridge.rmibridge.RMIBridgeProxyImpl_Stub.executeQuery(RMIBridgeProxyImpl_Stub.java:581)
        at com.venetica.vbr.ejb.bridge.rmibridge.RMIBridge.executeQuery(RMIBridge.java:1480)
        at com.venetica.vbr.ejb.access.AccessServices.execQuery(AccessServices.java:6628)
        at com.venetica.vbr.client.Query.execItemQuery(Query.java:482)
        at commandline.ExecQuery.performAction(ExecQuery.java:401)
        at commandline.ExecQuery.main(ExecQuery.java:143)
Caused by: com.venetica.vbr.client.ItemNotFoundException: COEN0046E: The TestNoProp item class was not found. Ensure that the item class specified is correct and try again.
        at com.venetica.vbr.ejb.bridge.livelink.LivelinkBridge.getCECategory(LivelinkBridge.java:10831)
        at com.venetica.vbr.ejb.bridge.livelink.LivelinkBridge.buildQueryString(LivelinkBridge.java:7818)
        at com.venetica.vbr.ejb.bridge.livelink.LivelinkBridge.executeQuery(LivelinkBridge.java:5333)
        at com.venetica.vbr.ejb.bridge.rmibridge.RMIBridgeProxyImpl.executeQuery(RMIBridgeProxyImpl.java:616)
        at sun.reflect.GeneratedMethodAccessor32.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:618)
        at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:317)
        at sun.rmi.transport.Transport$1.run(Transport.java:168)
        at java.security.AccessController.doPrivileged(AccessController.java:274)
        at sun.rmi.transport.Transport.serviceCall(Transport.java:164)
        at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:506)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.handleRequest(TCPTransport.java:838)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:912)
        at java.lang.Thread.run(Thread.java:811)
Caused by: com.venetica.vbr.client.VeniceBridgeException: COEN0045E: An error occurred while retrieving the item class list from the repository.
        at com.venetica.vbr.ejb.bridge.livelink.LivelinkBridge.fillLLCategories(LivelinkBridge.java:10808)
        at com.venetica.vbr.ejb.bridge.livelink.LivelinkBridge.getLLCategories(LivelinkBridge.java:10661)
        at com.venetica.vbr.ejb.bridge.livelink.LivelinkBridge.getCECategory(LivelinkBridge.java:10828)
        ... 14 more
Caused by: com.venetica.vbr.client.VeniceBridgeException: COEN0045E: An error occurred while retrieving the item class list from the repository.
        at com.venetica.vbr.ejb.bridge.livelink.LivelinkBridge.getCategories(LivelinkBridge.java:10919)
        at com.venetica.vbr.ejb.bridge.livelink.LivelinkBridge.fillLLCategories(LivelinkBridge.java:10774)
        ... 16 more
Caused by: com.opentext.api.LLIOException: Could not access server
        at com.opentext.api.LLConnect.createSocket(Unknown Source)
        at com.opentext.api.LLConnect.executeTraditional(Unknown Source)
        at com.opentext.api.LLConnect.execute(Unknown Source)
        at com.opentext.api.LAPI_DOCUMENTS.GetObjectInfo(Unknown Source)
        at com.venetica.vbr.ejb.bridge.livelink.LivelinkBridge.getCategories(LivelinkBridge.java:10903)
        ... 17 more