Oct 24, 2019 · Hello, I have a corporate LAN/Wifi network and I have some users who need to connect to another site in company via SSL VPN (I can't do direct VPN with the other site). Within my corporate network they cannot make the connection, always gives the error: "Unable to establish VPN connection. The VPN server may be unreachable. (-14)". Stops at 80%.

51 Error code Fix - VPN Clients - YouTube Sep 30, 2012 Cisco VPN Client for Mac OS X "Error 51: Unable to After a little bit of searching I found out that the user’s system is 64-bit and the Cisco VPN Client only comes in the 32-bit flavor. The easiest way to get Mac OS X into 32-bit mode is to restart the computer and hold the 3 and 2 keys while it boots.

A fix for 'Error 51' with the Cisco VPN Client - Mac OS X

Error 51: Unable to communicate with the VPN subsystem VPN client agent was unable to create the interprocess communication depot

a security update for the Macs may have broken Cisco VPN client versions 4.8 or earlier. However, VPN client version 4.9 or above works, as I have since installed the …

When you try to run the Cisco VPN Client on a Mac you get “Error 51: Unable to communicate with the VPN subsystem”.   I ran into this issue while trying to get the Mac version of Cisco VPN Client to run on the only Mac user’s system I support. I have installed Mac OS X and the Cisco VPN client pops up an error when I launch it. I would like to see your suggestions about this error before I decide on what to do. Please keep in mind that am new to the Mac world. Error 51: Unable to communicate with VPN subsystem. MAC OS-X Lion and Error 51 - Help Needed ASAP Please Hi, you cannot configure it (I guess TCP is not supported) but if the client see in Phase 1 that ESP is not working it will switch back to UDP-4500 (NAT-T). A while back, after getting "51'd" again, I went in search of a better solution -- and I found one. In Terminal, use this relatively simple command to stop and restart the kernel extension that the Error 51: Unable to communicate with the VPN subsystem. Please make sure that you have at least one network interface that is currently active and has an IP address and start this application again. Most of Internet discussions on this error message revolve around MAC OS. But this error I was able to fix on Windows XP. Normally you would be right on track - more times than not, "VPN Subsystem" problems have to do with the vpn client software not properly communicating with the operating system. Don't know if you're dealing with a "windows thing" or an environmental issue - firewall, etc. Prior to upgrading to Lion there were no issues using Cisco's VPN Client (4.9.01). With Lion, Error 51 is being returned stating it is unable to communication with the subsystem. Is there a known workaround for this?