why is port 500 in use and how can I free it? VPNC error
- by kirill_igum
i tried to use network manager to connect to my university's vpn; it didn't work.
then i used a command line vpnc:
> sudo vpnc
[sudo] password for kirill:
Enter IPSec gateway address: vpn.net.**.edu
Enter IPSec ID for vpn.net.**.edu: **
Enter IPSec secret for **@vpn.net.**.edu:
Enter username for vpn.net.**.edu: **
Enter password for **@vpn.net.**.edu:
vpnc: Error binding to source port. Try '--local-port 0'
Failed to bind to 0.0.0.0:500: Address already in use
then i did this:
sudo vpnc --local-port 0
with the same config and it all worked.
i'd like to be able to use network manager gui to connect to vpn.
I wanted to find out which program uses the port 500:
> sudo netstat -a |grep 500
tcp 0 0 *:17500 *:* LISTEN
udp 0 0 *:4500 *:*
udp 0 0 *:17500 *:*
unix 3 [ ] STREAM CONNECTED 63500
unix 3 [ ] STREAM CONNECTED 12500 @/tmp/.X11-unix/X0
there is nothing that uses 500
i'm using ubuntu 10.10 on thinkpad x201t
