Never heard of (or don't remember...) UTcomp enforcing mutators unless it's configured, but whatever. I'm not that experienced with running the server from the Client, only used the Dedicated Package for that.
Again, a full log would be helpful. That statement reads like you didn't assign a seperate port for your Webadmin. Default is 8080, you can assign any other port. We established a best practice of Gameport+1 for the sake of usability.
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