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+# Check the port for torchrun is open via ncat
+
+## Top
+
+Questions to [David Rotermund](mailto:davrot@uni-bremen.de)
+
+
+This is my script (connection_test.sh) that tests if a connection between two computer of a given port is possible: 
+
+You need the master_ip and master_port: 
+
+```shell
+master_ip="10.10.10.10"
+master_port="40001"
+python_file="main.py"
+
+ip_check=`ip addr | grep $master_ip | wc -l`
+
+if [[ $ip_check == "1" ]]
+then
+    echo "Master"
+    echo "OK OK OK OK OK OK OK" | ncat -l -p $master_port
+else
+    echo "Client"
+    ncat $master_ip $master_port
+```
+
+If this fails, the port is already used or your firewall settings is blocking it. 
+