iperf bind failed: Permission denied

For some reason doesn't work for port 80 and 8080
C:\>iperf -s -p 80
bind failed: Permission denied.

Other ports like 443 works.  
Is it because something is using port 80 already and iperf cannot bind it?
LVL 17
Tiras25Asked:
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arrorynCommented:
ports 80 and 8080 will be bound to your web traffic, both are standards for HTTP. What are you testing on?
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Tiras25Author Commented:
Testing communication over the VPN tunnel.
I can see the server is listening on port 80.
TCP    0.0.0.0:80             0.0.0.0:0              LISTENING       4

However cannot test if accessible over the VPN.
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arrorynCommented:
PID 4 is "system" and that's pretty much standard config. It's not the browser that's listening on the port; what does the machine you're interrogating do? Web server possibly?
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Tiras25Author Commented:
Yes it is a Web server.
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arrorynCommented:
Then the server is doing "its duty" - you can't interrogate port 80 or port 8080 because it's constantly in use by the server OS.
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Tiras25Author Commented:
Great. That what I thought.
Thank you!
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