OpenVPN Support Forum

Posted: **Mon May 16, 2011 1:57 pm**

All,
recently we started receiving an error on one of our concentrators, this box has about 750 +/- client connections and seams to be locking up and requiring a restart of the openvpn service about 10 times per day. we are using a custom "auth-user-pass-verify" script written in perl to auth the users against freeradius.
the errors we are receiving are listed below. The server is working and authenticating users just fine for a while then without warning it will blow up and throw the errors and need to be restarted.
Any help you can provide would be great.

Thanks,
Aaron

May 12 20:23:22 csg2 openvpn[2686]: 64.xxx.xxx.x:42136 WARNING: Failed running command (--auth-user-pass-verify): external program fork failed
May 12 20:23:22 csg2 openvpn[2686]: 64.xxx.xxx.x:42136 TLS Auth Error: Auth Username/Password verification failed for peer

then

May 12 20:23:23 csg2 openvpn[2686]: TCP/UDP: Closing socket
May 12 20:23:23 csg2 openvpn[2686]: WARNING: Failed running command (--client-disconnect): external program fork failed

Posted: **Mon May 16, 2011 3:14 pm**

depends a bit on your server config....
is 'script-security 2' present in the server config?
can you try

Code: Select all

script-security 3 system

just to test; is there enough memory available for the external fork? does the script run stand-alone (i.e. just start the script on the command-line)

Posted: **Mon May 16, 2011 3:59 pm**

janjust wrote:depends a bit on your server config....
is 'script-security 2' present in the server config?
can you try
Code: Select all
script-security 3 system
just to test; is there enough memory available for the external fork? does the script run stand-alone (i.e. just start the script on the command-line)

Here is the config from the server.

Code: Select all

daemon
verb 4
status /opt/openvpn/status/vtun1.status 30
dev-type tun
dev vtun1
mode server
tls-server
topology p2p
keepalive 10 60
lport 443
proto tcp-server
ca /opt/openvpn/easy-rsa/keys/ca.crt
cert /opt/openvpn/easy-rsa/keys/csg2.crt
key /opt/openvpn/easy-rsa/keys/csg2.key
crl-verify /opt/openvpn/easy-rsa/keys/crl.pem
dh /opt/openvpn/easy-rsa/keys/dh2048.pem
server 10.x.x.x 255.255.248.0 
script-security 3
client-config-dir /opt/openvpn/ccd
ccd-exclusive
client-connect /opt/openvpn/client-connect.sh
client-disconnect /opt/openvpn/client-connect.sh
push route 10.x.x.x 255.255.254.0
push route 10.x.x.x 255.255.255.0
push route 10.x.x.x 255.255.255.0
txqueuelen 3000
tcp-queue-limit 1000
tcp-nodelay
reneg-sec 28800
comp-lzo no
auth-user-pass-verify /opt/openvpn/radauth.pl via-env

Here is one of the clients:

Code: Select all

client 1
dev tun
proto tcp
comp-lzo no
remote csg2 443
auth-retry nointeract
nobind
persist-key
persist-tun
ca /etc/config/sslca.crt
cert /etc/config/MA.crt
key /etc/config/MA.key
ns-cert-type server
verb 3
dev-node /dev/net/tun
pull
auth-user-pass /etc/config/up

Posted: **Tue May 17, 2011 10:11 am**

your server and client config do not look too weird

did you try using

Code: Select all

script-security 3 system

can you run the perl script on the command line?
what are the ulimit settings prior to starting openvpn?

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