0

When I tried to listen on port 80 in Windows 7 with netcat, I get this error:

C:\Users\sashoalm>echo "hello, world" | netcat.exe -l -p 80
Can't grab 0.0.0.0:80 with bind

On the other hand, selecting any other port works.

1

It turned out this port was being used. I used netstat -a -b to find out which program uses it (it requires elevated privileges).

It turned out Skype will use port 80 and 443 for incoming connections, after reading https://support.skype.com/en/faq/FA148/which-ports-need-to-be-open-to-use-skype-for-windows-desktop, I changed that and now it works fine, netcat can listen on this port.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.