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If the user adds multiple server installations that all use the same port the IDE cannot distinguish between them (as it uses http to communicate with server). This leads to confusing situation in Server Registry (server status and start/stop actions do not know what server they work with).
won't fix in 4.0
cosider this when designing new APIs
I don't think this is really an issue. In most cases when user is using external Tomcat, he is using instance running on the default port 8080 and since the bundled Tomcat runs on 8084 there is no port conflict. On the other hand, even if the two instances had different port, user can still change the port manually in server.xml file and create thus the conflict - so there is no point in trying to prevent it. More over, I can imagine scenarios when user wants to have two instances of Tomcat with the same port registered in the IDE. marking as WONTFIX