The possible causes of this issue can be: 1. Bad port defined in the connection details: 2. Use of user name and password: must be blank 3. Spectrum server is missing the following lines: jvm_opt=-Dcom.sun.management.jmxremote jvm_opt=-Dcom.sun.management.jmxremote.port=8008 jvm_opt=-Dcom.sun.management.jmxremote.authenticate=false jvm_opt=-Dcom.sun.management.jmxremote.ssl=false In windows: C:\win32app\Spectrum\tomcat\bin\OneClickService.conf In linux $SPECROOT/tomcat/bin/catalina.sh Example of wrong configuration: