diff --git a/Troubleshooting.md b/Troubleshooting.md
index 464ddd6..14366ec 100644
--- a/Troubleshooting.md
+++ b/Troubleshooting.md
@@ -16,6 +16,7 @@ If you're using a mac; make sure you have completed the mac-installation wiki pa
 
 ## Problem 3: Habbo loads, but G-Earth isn't connected
 * Your hosts file might have some permissions issues. Delete it and place a new one: https://github.com/sirjonasxx/G-Earth/issues/17
+* The port of the hotel you're trying to connect with (30000 or 38101 on most hotels) must not be in use by any other process than G-Earth. There are platform-specific ways to find out what ports are in-use by googling.
 
 ## Creating an Issue
 If the solutions did NOT help you, navigate to https://github.com/sirjonasxx/G-Earth/issues and, if it hasn't been solved before, create a new issue.