Errors with my OpenVPN

DamienD · Jun 9, 2012, 1:37 PM

Hello,

I have my openVPN set up for more than one year and recently it started to give me errors like:

Sat Jun 09 15:23:55 2012 OpenVPN 2.3-alpha1 Win32-MSVC++ [SSL (OpenSSL)] [LZO2] [PF_INET6] [IPv6 payload 20110522-1 (2.2.0)] built on Feb 21 2012
Enter Management Password:
Sat Jun 09 15:24:04 2012 IMPORTANT: OpenVPN's default port number is now 1194, based on an official port number assignment by IANA.  OpenVPN 2.0-beta16 and earlier used 5000 as the default port.
Sat Jun 09 15:24:04 2012 WARNING: Make sure you understand the semantics of --tls-remote before using it (see the man page).
Sat Jun 09 15:24:04 2012 NOTE: OpenVPN 2.1 requires '--script-security 2' or higher to call user-defined scripts or executables
Sat Jun 09 15:24:04 2012 Control Channel Authentication: using 'grenwall-udp-1194-tls.key' as a OpenVPN static key file
Sat Jun 09 15:24:04 2012 UDPv4 link local (bound): [undef]
Sat Jun 09 15:24:04 2012 UDPv4 link remote: [AF_INET]XXX.XXX.XXX.XXX:1194
Sat Jun 09 15:24:05 2012 WARNING: this configuration may cache passwords in memory -- use the auth-nocache option to prevent this
Sat Jun 09 15:24:05 2012 Authenticate/Decrypt packet error: packet HMAC authentication failed
Sat Jun 09 15:24:05 2012 TLS Error: incoming packet authentication failed from [AF_INET]XXX.XXX.XXX.XXX:1194
Sat Jun 09 15:24:05 2012 Authenticate/Decrypt packet error: packet HMAC authentication failed
Sat Jun 09 15:24:05 2012 TLS Error: incoming packet authentication failed from [AF_INET]XXX.XXX.XXX.XXX:1194
Sat Jun 09 15:24:05 2012 Authenticate/Decrypt packet error: packet HMAC authentication failed
Sat Jun 09 15:24:05 2012 TLS Error: incoming packet authentication failed from [AF_INET]XXX.XXX.XXX.XXX:1194
Sat Jun 09 15:24:13 2012 Authenticate/Decrypt packet error: packet HMAC authentication failed
Sat Jun 09 15:24:13 2012 TLS Error: incoming packet authentication failed from [AF_INET]XXX.XXX.XXX.XXX:1194
Sat Jun 09 15:24:17 2012 TLS Error: unknown opcode received from [AF_INET]XXX.XXX.XXX.XXX:1194 op=12
Sat Jun 09 15:24:23 2012 [Road Warrior Server Certificate] Peer Connection Initiated with [AF_INET]XXX.XXX.XXX.XXX:1194
Sat Jun 09 15:24:25 2012 Authenticate/Decrypt packet error: packet HMAC authentication failed
Sat Jun 09 15:24:25 2012 TLS Error: incoming packet authentication failed from [AF_INET]XXX.XXX.XXX.XXX:1194
Sat Jun 09 15:24:28 2012 do_ifconfig, tt->ipv6=0, tt->did_ifconfig_ipv6_setup=0
Sat Jun 09 15:24:28 2012 open_tun, tt->ipv6=0
Sat Jun 09 15:24:28 2012 TAP-WIN32 device [Connexion au réseau local 2] opened: \\.\Global\{6415A5F7-F1C9-480C-B99B-477592EC39AC}.tap
Sat Jun 09 15:24:28 2012 Notified TAP-Win32 driver to set a DHCP IP/netmask of 192.168.200.6/255.255.255.252 on interface {6415A5F7-F1C9-480C-B99B-477592EC39AC} [DHCP-serv: 192.168.200.5, lease-time: 31536000]
Sat Jun 09 15:24:28 2012 Successful ARP Flush on interface [15] {6415A5F7-F1C9-480C-B99B-477592EC39AC}
Sat Jun 09 15:24:33 2012 Initialization Sequence Completed
Sat Jun 09 15:24:40 2012 Authenticate/Decrypt packet error: packet HMAC authentication failed
Sat Jun 09 15:25:04 2012 Authenticate/Decrypt packet error: packet HMAC authentication failed
Sat Jun 09 15:25:04 2012 Authenticate/Decrypt packet error: packet HMAC authentication failed
Sat Jun 09 15:25:04 2012 Authenticate/Decrypt packet error: packet HMAC authentication failed
Sat Jun 09 15:25:07 2012 Authenticate/Decrypt packet error: packet HMAC authentication failed
Sat Jun 09 15:25:09 2012 Authenticate/Decrypt packet error: packet HMAC authentication failed
Sat Jun 09 15:25:13 2012 Authenticate/Decrypt packet error: bad packet ID (may be a replay): [ #259 ] -- see the man page entry for --no-replay and --replay-window for more info or silence this warning with --mute-replay-warnings
Sat Jun 09 15:25:17 2012 Authenticate/Decrypt packet error: packet HMAC authentication failed

pFSense 2.0.1-RELEASE (i386) on an ALIX
Windows 7 client

any idea?

Thank you for your time!

Nachtfalke · Jun 9, 2012, 3:37 PM

Did you check the OpenVPN man page ?

http://openvpn.net/index.php/open-source/documentation/manuals/65-openvpn-20x-manpage.html
Take a look at:
–no-replay
--replay-window n [t]

They wrote to set OpenVPN verbose to 4 and check if the replay-windows is ok.

DamienD · Jun 19, 2012, 11:49 AM

Hello thank you for your time, apologies I hav'nt been able to look at it yet.

I'll come back to you as soon as I find time!

jimp · Jun 24, 2012, 5:12 PM

Those errors usually indicate a couple things:

1. cipher mismatch between server and client
2. clock is way off on one or the other

It could also be some other general mismatch of settings, but to say for sure we'd need to see the server and client config both

DamienD · Jun 24, 2012, 7:57 PM

Hello,

1. It worked flawlessly for about one year so I don't understand what could be wrong
2. It is not the case

I also used the client export plugin…

What files do you need to see?

jimp · Jun 24, 2012, 7:59 PM

The client config file, and /var/etc/openvpn/server(whatever).conf

Could also be a TLS key mismatch, something would have to have changed for it to do this though. Unless it's something in between corrupting the traffic.

DamienD · Jun 24, 2012, 8:22 PM

@/var/etc/openvpn/server2.conf:

dev ovpns2
dev-type tun
dev-node /dev/tun2
writepid /var/run/openvpn_server2.pid
#user nobody
#group nobody
script-security 3
daemon
keepalive 10 60
ping-timer-rem
persist-tun
persist-key
proto udp
cipher BF-CBC
up /usr/local/sbin/ovpn-linkup
down /usr/local/sbin/ovpn-linkdown
local 178.198.100.136
tls-server
server 192.168.200.0 255.255.255.0
client-config-dir /var/etc/openvpn-csc
username-as-common-name
auth-user-pass-verify /var/etc/openvpn/server2.php via-env
tls-verify /var/etc/openvpn/server2.tls-verify.php
lport 1194
management /var/etc/openvpn/server2.sock unix
max-clients 4
push "route 192.168.1.0 255.255.255.0"
client-to-client
ca /var/etc/openvpn/server2.ca
cert /var/etc/openvpn/server2.cert
key /var/etc/openvpn/server2.key
dh /etc/dh-parameters.1024
tls-auth /var/etc/openvpn/server2.tls-auth 0
comp-lzo
persist-remote-ip
float

@openvpn.ovpn:

dev tun
persist-tun
persist-key
proto udp
cipher BF-CBC
tls-client
client
resolv-retry infinite
remote MYADRESS 1194
tls-remote Road Warrior Server Certificate
auth-user-pass
pkcs12 grenwall-udp-1194.p12
tls-auth grenwall-udp-1194-tls.key 1
comp-lzo

DamienD · Jul 5, 2012, 9:46 AM

Did I put the wrong files?? ???