Ipsec on Details... https://www.deepreflect.net/tags/ipsec/ Recent content in Ipsec on Details... Hugo en-US Copyright © 2003 - 2026 Leonardo Rizzi Tue, 30 Jun 2026 03:28:29 +0200 Mac OS X - Cisco VPN Client https://www.deepreflect.net/2009/04/27/mac-os-x-cisco-vpn-client/ Mon, 27 Apr 2009 02:16:09 +0000 http://blog.deepreflect.net/?p=473 <p>If you are running Cisco&rsquo;s VPN Client on Mac OSX, you might be familiar with (or tormented by) &ldquo;Error 51: Unable to communicate with the VPN subsystem&rdquo;. The simple fix is to quit VPN Client, open a Terminal window, (Applications -&gt; Utilities -&gt; Terminal) and type the following from root user:</p> <div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-gdscript3" data-lang="gdscript3"><span style="display:flex;"><span><span style="color:#75715e"># /System/Library/StartupItems/CiscoVPN/CiscoVPN restart</span> </span></span><span style="display:flex;"><span> </span></span><span style="display:flex;"><span>Stopping Cisco Systems VPN Driver </span></span><span style="display:flex;"><span>kextunload: unload kext <span style="color:#f92672">/</span>System<span style="color:#f92672">/</span>Library<span style="color:#f92672">/</span>Extensions<span style="color:#f92672">/</span>CiscoVPN<span style="color:#f92672">.</span>kext succeeded </span></span><span style="display:flex;"><span>Starting Cisco Systems VPN Driver </span></span><span style="display:flex;"><span>kextload: <span style="color:#f92672">/</span>System<span style="color:#f92672">/</span>Library<span style="color:#f92672">/</span>Extensions<span style="color:#f92672">/</span>CiscoVPN<span style="color:#f92672">.</span>kext loaded successfully </span></span></code></pre></div> If you are running Cisco’s VPN Client on Mac OSX, you might be familiar with (or tormented by) “Error 51: Unable to communicate with the VPN subsystem”. The simple fix is to quit VPN Client, open a Terminal window, (Applications -> Utilities -> Terminal) and type the following from root user:

# /System/Library/StartupItems/CiscoVPN/CiscoVPN restart

Stopping Cisco Systems VPN Driver
kextunload: unload kext /System/Library/Extensions/CiscoVPN.kext succeeded
Starting Cisco Systems VPN Driver
kextload: /System/Library/Extensions/CiscoVPN.kext loaded successfully
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