For no clear reason, OpenVPN on Mac with Tunnelblick (any version, had this problem for a few years already) results in these kind of error messages (and refuses to connect):
2013-02-05 17:44:31 write UDPv4: Can't assign requested address (code=49) 2013-02-05 17:44:33 write UDPv4: Can't assign requested address (code=49)
This seems to appear more often when swapping WiFi/IP range (after my Mac goes into sleep). But also happens when connecting to the same WiFi. It doesn’t change anything whether I disconnect OpenVPN before putting the Mac to sleep.
The solution I’ve found to solve this is:
- Disconnect OpenVPN (via Tunnelblick)
- Turn off WiFi
- Run the script I’ve attached below (flush.sh)
- Fill in your admin/sudo password
- Hit ctrl+C if it doesn’t exit instantly (happens in 99% of the cases)
- Run the script once or twice more to be sure, it will exit correctly this time
- Reconnect to the WiFi
- Reconnect OpenVPN (via Tunnelblick): this time it will work
The script (name it flush.sh, chmod +x, and run ./flush.sh via Terminal):
Edit: updated script (29/01/2014)
#!/bin/bash # Change IFACE to match your WiFi interface # (en0 on Macbook Air and Retina, en1 on old Macbook Pros with ethernet) IFACE=en0 sudo ifconfig $IFACE down sudo route flush sudo ifconfig $IFACE up
In case the script hangs (sometimes, route flush hangs): hit ctrl+C, and execute it again.