[Openvpn-users] problems with lzo compression on windows with OpenVPN

[Michiel van Es <info@xxxxxxxxxxxxxxxxx>]

Hi,
I'm running  OpenVPN 1.5.0 i386-redhat-linux [SSL]
[LZO] [PTHREAD] built on Nov 25 2003 on the VPN
server (Tao Linux - RHEL 3.0 clone) and 1.6 on the
windows client(s).
When I try to connect to the server with lzo
compression enabled I get the following errors:
Tue May 11 12:33:35 2004 17: Attempting to lock
Win32 semaphore 'openvpn_netcmd'
 prior to net shell command (timeout = 600 sec)
Tue May 11 12:33:35 2004 18: TAP-WIN32 device
[Local Area Connection 2] opened:
\\.\{7C6E084D-76BA-4A60-BFAF-98FD05FE8804}.tap
Tue May 11 12:33:35 2004 19: TAP-Win32 Driver
Version 5.10
Tue May 11 12:33:35 2004 20: TAP-Win32 MTU=1500
Tue May 11 12:33:35 2004 21: Notified TAP-Win32
driver to set a DHCP IP/netmask
of 10.3.0.2/255.255.255.0 on interface
{7C6E084D-76BA-4A60-BFAF-98FD05FE8804} [D
HCP-serv: 10.3.0.0, lease-time: 31536000]
Tue May 11 12:33:35 2004 22: Successful ARP Flush
on interface [2] {7C6E084D-76B
A-4A60-BFAF-98FD05FE8804}
Tue May 11 12:33:35 2004 23: Data Channel MTU
parms [ L:1577 D:1577 EF:45 EB:19
ET:32 EL:0 ]
Tue May 11 12:33:35 2004 24: Local Options String:
'V3,dev-type tap,link-mtu 157
7,tun-mtu 1532,proto UDPv4,ifconfig 10.3.0.0
255.255.255.0,comp-lzo,cipher BF-CB
C,auth SHA1,keysize 128,secret'
Tue May 11 12:33:35 2004 25: Expected Remote
Options String: 'V3,dev-type tap,li
nk-mtu 1577,tun-mtu 1532,proto UDPv4,ifconfig
10.3.0.0 255.255.255.0,comp-lzo,ci
pher BF-CBC,auth SHA1,keysize 128,secret'
Tue May 11 12:33:35 2004 26: Local Options hash
(VER=V3): '8bf52b38'
Tue May 11 12:33:35 2004 27: Expected Remote
Options hash (VER=V3): '8bf52b38'
Tue May 11 12:33:35 2004 28: UDPv4 link local
(bound): [undef]:5000
Tue May 11 12:33:35 2004 29: UDPv4 link remote:
82.161.23.36:5000

Tue May 11 12:33:41 2004 30: Bad LZO decompression
header byte: 40

I installed the windows lzop package in
c:\winnt\system32 but  it doen't fix the
compression problem.
When I dissable the compression in my config file
and re-establish the connection; everything works
fine.

Does anyone know what the problem might be?

Thanks in advance.

Kind regards,

Michiel van Es





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