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Issue Description: I can't get the webserver to work. I've opened the port locally already and it still doesn't work. What can I do?
[19:35:01 ERROR]: Failed to start WebServer on address 0.0.0.0:8123 : Failed to bind to 0.0.0.0/0.0.0.0:8123

• Dynmap Version: 3.4
• *Server Version:1.15.2 build 271 *
• Pastebin of Configuration.txt: https://pastebin.com/9bUKhWk4
• Server Host (if applicable): Selfhosted
• Pastebin of crashlogs or other relevant logs: no crash log
• Other Relevant Data/Screenshots: nope
• Steps to Replicate: Please be clear in this section so we can replicate your issue

[ ] I have looked at all other issues and this is not a duplicate
[ ] I have been able to replicate this

That means that that port is already in use, only one port can be used at the same time by a given application