OpenVPN client sometime does no reconnects

mferlitsch

Hi,

my OpenVPN clients run under Windows 7 64. I use the OpenVPN GUI an run it as administrator.

Sometimes it happens that the GUI pops up a windows that "Reconnecting to xyz has failed" and then the user must reconnect by himself.

Tue Jun 26 17:59:08 2012 read UDPv4: No buffer space available (WSAENOBUFS) (code=10055)
Tue Jun 26 17:59:08 2012 read UDPv4: No buffer space available (WSAENOBUFS) (code=10055)
Tue Jun 26 17:59:08 2012 read UDPv4: No buffer space available (WSAENOBUFS) (code=10055)
Tue Jun 26 17:59:09 2012 read UDPv4: No buffer space available (WSAENOBUFS) (code=10055)
Tue Jun 26 17:59:09 2012 Inactivity timeout (--ping-restart), restarting
Tue Jun 26 17:59:09 2012 TCP/UDP: Closing socket
Tue Jun 26 18:00:55 2012 SIGUSR1[soft,ping-restart] received, process restarting
Tue Jun 26 18:00:55 2012 Restart pause, 2 second(s)
Tue Jun 26 18:00:57 2012 NOTE: OpenVPN 2.1 requires '--script-security 2' or higher to call user-defined scripts or executables
Tue Jun 26 18:00:57 2012 Re-using pre-shared static key
Tue Jun 26 18:00:57 2012 Socket Buffers: R=[0->0] S=[0->0]
Tue Jun 26 18:00:57 2012 Preserving previous TUN/TAP instance: OpenVPN
Tue Jun 26 18:00:57 2012 Data Channel MTU parms [ L:1344 D:1300 EF:44 EB:4 ET:0 EL:0 ]
Tue Jun 26 18:00:57 2012 Local Options hash (VER=V4): '73b8d93a'
Tue Jun 26 18:00:57 2012 Expected Remote Options hash (VER=V4): '6858df8e'
Tue Jun 26 18:00:57 2012 Set socket to non-blocking mode failed: Ein Vorgang bezog sich auf ein Objekt, das kein Socket ist.   (errno=10038)
Tue Jun 26 18:00:57 2012 Exiting
Tue Jun 26 18:00:57 2012 Closing TUN/TAP interface

What does "Set socket to non-blocking mode failed:" mean? Does it comes from Windows Kernel?

How can I raise the "Restart pause, 2 second(s)"? Maybe 2 seconds are sometimes too short?

Regards, Markus

manuel19

Hi there! I was having the same issue.
Try adding this lines in you server.conf

dev tap
tls-server

--proto tcp-server
verb 3

persist-tun
persist-key
comp-lzo

keepalive 10 30
status openvpn-status.log

In the client add this:

float

tls-client

ns-cert-type server


--proto tcp-client

user nobody
group nobody

persist-key
persist-tun

#ping 15

verb 3
comp-lzo

keepalive 10 30
--connect-retry 10
dev tap1

I have this configuration running very well. Everytime the client boot, try to connect, it get connected to server.

If the issue persist, making infites ping to the server IP. Maybe the server sometimes go down and then up again.

Try this:

CMD>ping YOU-SERVER-IP -t <--- using -t

Let me know if it works for you.

mferlitsch

I also tried it via TCP instead of UDP.
But same problem. When I get a HMAC error on client side, the clients reconnects and sometimes there i no socket buffer available for new connection - then the GUI-popup comes and the client stops to reconnect.

I thnik it's a problem of Windows 7 64-bit. The connections from the client to the servers are stable - and on servers logfiles there are no errors.