reinstalling doesnt work Anders from RTP #11 | Wednesday, June 20, 2007 4:52 PM Rutger: This is the first time I'm hearing about this error in Windows. Anyway, for those of you who have exhausted all your resources, try looking in the Devices area of your Leopard OS (in the finder window) to see the full version of EDIT: The MacWorld guys came up with a simpler way to do the same thing: sudo SystemStarter restart CiscoVPN Posted by Anders Brownworth Monday, November 13, 2006 7:25 PM Tweet Comments I think what was in my Applications folder was an Alias, and perhaps "error 51" means the application is missing parts?
I don't know what you mean by fresh re-install. Cisco's VPN client is written for the 32 bit architecture. Speedwolf from UK #112 | Monday, October 6, 2008 1:47 PM Worked like a charm, cheers. AL from round rock/texas/usa #207 | Thursday, December 9, 2010 5:56 PM worked perfectly johnboy from yeehaw #208 | Monday, December 13, 2010 7:36 PM you're awesome. http://www.macworld.com/article/1136208/ciscovpn.html
Works like a charm. If all else fails, you may need to reinstall your OS though I've never heard of things getting so corrupted that this is necessary. Sorry There was an error emailing this page. nicolas from france #192 | Tuesday, July 20, 2010 12:11 PM The cisco driver doesn't work when running the 64 bits kernel.
Jeremy Ricketts from Pasadena, CA USA #64 | Friday, April 4, 2008 12:19 PM Just found this page. Haven't tried it wireless yet, but I can at least login. Your instructions were wonderfully easy and I now have the VPN working again. Unable To Communicate With The Vpn Subsystem Windows 8 Voila it's working.
But restarting vpn didn't worked. Cisco Vpn Client Error 51 Windows 8 VPN Service has not been started. Any other thoughts? http://www.macworld.com/article/1136208/ciscovpn.html Grant from Melbourne, Australia #82 | Friday, June 13, 2008 7:36 AM Thank you.
Allen from South Africa #239 | Friday, August 12, 2011 7:04 AM Hi, Thanks for the info on http://anders.com/guides/native-cisco-vpn-on-mac-os-x/ I have now switched to native, since the Cisco client never worked Error 51 Credit Card r from CT #166 | Tuesday, November 10, 2009 3:35 PM 3 years on, your post is still solving problems. Thanks. Kibar from Toronto #168 | Thursday, November 12, 2009 2:55 PM Hi all, Great suggestions but I am running Leopard 10.5.8 and I tried to follow some of the suggestions mentioned
Fixed on OS X 10.5.3 with VPN Client 4.9.01 (100). http://www.domainwebcenter.com/?p=1268 Anders from RTP #23 | Wednesday, November 7, 2007 7:05 AM John / Pascal: I am hearing reports that OS X 10.5 Leopard is working with Cisco VPN 4.9.01 if you Error 51 Unable To Communicate With The Vpn Subsystem Windows 7 Thanks! Error 51 Cisco Vpn Windows 10 It worked great for me!
Connections would be attempted and a password was requested but after submitting, the connection would never be established and eventually the Cisco VPN app would time out and go back to nick from Australia #219 | Thursday, April 7, 2011 5:17 AM I tried following the instructions and inside Terminal i get the error /System/Library/Extensions/CiscoVPN.kext failed to load - (libkern/kext) requested architecture/executable I'm running 10.5.1. THANK YOU a million times... Error 51 Unable To Communicate With The Vpn Subsystem Windows 10
I am getting the error51, I tried to use the script and still get the error. So why was this working on my laptop but not my MacPro? Not sure why. Jack from Palo Alto, CA #48 | Saturday, January 26, 2008 1:53 PM Thanks for the tip!
This may have been the issue, I don't know. Error 51 Unable To Communicate With The Vpn Subsystem Windows 8 In Terminal, type: cat /etc/resolv.conf and check the nameserver lines against what your tech department considers "internal DNS servers". Kei from Fremont, ca, usa #174 | Saturday, February 20, 2010 2:30 PM Great tip and it worked!
A Virus protection program (bit defender) was blocking the VPN client. Fab 2011/10/24 at 07:22 Thank you so much! Hinton from Indianapolis/IN/USA #62 | Thursday, March 20, 2008 8:54 AM Found this page while trying to search for solutions to error message addressed in this post. Cisco Vpn Error 56 It is possible that the name of the .kext changed.
Erik van der Neut from Cambridge, Massachusetts, USA #40 | Thursday, December 13, 2007 1:03 PM Brilliant! Again, Thanks. Thanks! Mario from Pennsylvania #73 | Friday, May 9, 2008 9:08 AM Thanks for the tip...
Worked great. There is, apparently, a more permanent fix, but I'm a bit nervous to try it. Joe from NYC #109 | Tuesday, September 23, 2008 6:22 AM Hey, Thank you for the advice. Reason 403: Unable to contact the security gateway.
both sudo commands do not work, ifconfig down does not work too and uninstalling and reinstalling either. Here is what I get: Stopping Cisco Systems VPN Driver kextunload: unload kext /System/Library/Extensions/CiscoVPN.kext failed Starting Cisco Systems VPN Driver extension /System/Library/Extensions/CiscoVPN.kext does not contain code for this architecture I don't
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