Installation > Appendix 3: Troubleshooting > Problems Experienced When Using the Product > I Cannot Use Another Application at the Same Time as Modeler
I Cannot Use Another Application at the Same Time as Modeler
If you experience problems using an application at the same time as Modeler, this problem may be caused by a TCP/IP port number conflict. You can view the port numbers allocated to other applications through the SERVICES file on your computer. You must check and review your firewall settings. For more information, see Setting up the Windows Firewall.