I love IDEA, a great Java IDE. So I was very grateful to Robert F. Beeger for posting a simple explanation for a frustrating problem I’ve had many times: IDEA will not launch Tomcat configurations, complaining that the address (e.g. http://localhost:8080) is in use, when it’s obviously not. The real culprit is Kaspersky Anti-Virus, which is a bit zealous if effective in blocking apps from potentially unsafe activities on Windows systems. I went into the Settings, added IDEA’s .exe to the Trusted apps and granted it rights — and now it all works again.
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