我在Windows 7中遇到一个有趣的问题，那就是几个客户的OpenVPN客户端不断地连接和断开连接到我的Ubuntu 10.04 LTS服务器。 我可以通过OSX，iPhone，iPad，Android连接到同一台服务器，但由于某些原因，某些Windows 7客户端遇到了问题。
客户端版本是OpenVPN 2.1.3 i686-pc-mingw32 [SSL] [LZO2] [PKCS11]build于2010年8月20日
从检查客户端上的日志，以下行是可疑的：
Route addition via IPAPI succeeded [adaptive] 在服务器上，以下行也是可疑的：
CTRL: Ignored a SET LINK INFO packet with real ACCMs!
我一直没有find任何理由为什么客户端只会在Windows 7中有问题，我不知道为什么服务器将忽略其设置的链接信息包。
Windows 7中的OpenVPN客户端具有以下function：
Sun Aug 14 23:39:04 2011 TEST ROUTES: 1/1 succeeded len=0 ret=1 a=0 u/d=up Sun Aug 14 23:39:04 2011 C:\WINDOWS\system32\route.exe ADD 212.117.170.76 MASK 255.255.255.255 192.168.2.1 Sun Aug 14 23:39:04 2011 ROUTE: CreateIpForwardEntry succeeded with dwForwardMetric1=100 and dwForwardType=4 Sun Aug 14 23:39:04 2011 Route addition via IPAPI succeeded [adaptive] Sun Aug 14 23:39:04 2011 C:\WINDOWS\system32\route.exe ADD 0.0.0.0 MASK 128.0.0.0 10.24.125.1 Sun Aug 14 23:39:04 2011 ROUTE: CreateIpForwardEntry succeeded with dwForwardMetric1=30 and dwForwardType=4 Sun Aug 14 23:39:04 2011 Route addition via IPAPI succeeded [adaptive] Sun Aug 14 23:39:04 2011 C:\WINDOWS\system32\route.exe ADD 128.0.0.0 MASK 128.0.0.0 10.24.125.1 Sun Aug 14 23:39:04 2011 ROUTE: CreateIpForwardEntry succeeded with dwForwardMetric1=30 and dwForwardType=4 Sun Aug 14 23:39:04 2011 Route addition via IPAPI succeeded [adaptive] Sun Aug 14 23:39:04 2011 Initialization Sequence Completed Sun Aug 14 23:39:05 2011 Connection reset, restarting [-1] Sun Aug 14 23:39:05 2011 TCP/UDP: Closing socket Sun Aug 14 23:39:05 2011 C:\WINDOWS\system32\route.exe DELETE 212.117.170.76 MASK 255.255.255.255 192.168.2.1 Sun Aug 14 23:39:05 2011 Route deletion via IPAPI succeeded [adaptive]
服务器上的日志说：
Aug 16 06:52:51 pppd[27924]: Connect: ppp27 <--> /dev/pts/28 Aug 16 06:52:57 pppd[27924]: Unsupported protocol 'IPv6 Control Protocol' (0x8057) received Aug 16 06:52:58 pptpd[27923]: CTRL: Ignored a SET LINK INFO packet with real ACCMs! Aug 16 06:53:00 pppd[27924]: local IP address 10.42.124.1 Aug 16 06:53:00 pppd[27924]: remote IP address 10.42.124.34 Aug 16 06:53:01 pppd[27924]: MPPE 128-bit stateless compression enabled Aug 16 06:53:03 pppd[27924]: MPPE disabled Aug 16 06:53:03 pppd[27924]: Connect time 0.1 minutes. Aug 16 06:53:03 pppd[27924]: Sent 390 bytes, received 540 bytes. Aug 16 06:53:09 pppd[27924]: Connection terminated. Aug 16 06:53:09 pppd[27924]: write: Bad file descriptor (9) Aug 16 06:53:09 pppd[27924]: Modem hangup Aug 16 06:53:09 pppd[27924]: Exit.