iperf UDP server start error, bind failed: Operation not permitted
OS : Windows 8, Tool : Jperf, internal Tool : iperf
i want to start UDP Server listener.
Command Used:-
iperf -s -u -P 0 -i 1 -p 5001 -l 1470 -f k -t 10
Server listening on UDP port 5001
Receiving 1470 byte datagrams
UDP buffer size: 64.0 KByte (default)
Error as follows :-
bind failed: Operation not permitted
recvfrom failed: Invalid argument
Comments :-
1) My Windows Firewall is OFF
2) Antivirus is OFF
Any Registory changes required here to access windows UDP ports ? Any Idea ?
Answer
I had the same problem, but only after I installed an altogether different application on the same machine where I had successfully run iperf -s -u previously. When I assigned another port for iperf to use such as 5555 or 6007 the iperf server no longer gave a bind error and presented the stats after the transfer as expected.
I suspect the reason for this is that another program that I installed grabbed the UDP port or range of ports for itself. This would be easy for a program to do if iperf is running in user-mode instead of daemon mode. On the other hand some programs are still particular about running on specific ports, so in case of a conflict you may still have to assign specific port usage.