Fixing Jan-2022 Windows VPN problems • 18 Jan 2022
Chances are, if you are using a non-pure-Windows VPN on Windows, you’ve had an interesting few days.
In our case, we’re using a Meraki VPN server with the standard Windows VPN client,
and after the recent KB5009543 update (fixing the “Windows IKE Extension Denial of Service Vulnerability” ),
any attempt to connect to our VPN was met with the following error:
Cannot connect to [VPN name]. The L2TP connection attempt failed because the security layer encountered a
processing error during initial negotiations with the remote computer .
Stuff to install on a new Windows PC • 17 Sep 2008
That is, the stuff I install on a new Windows PC. Since I need this list several times a year, why not make a blog post of it. As you will see,I have a more than average interest in video (conversion) and sysadmin (SSH/FTP). The links typically go straight to the download page.
Fix by disabling: error 1016 in event log • 21 Jun 2004
Due to one of life’s mysteries, the following error shows up dozens of times per day in the event log of one of our web servers (Win2000/IIS):
Port redirection in Windows • 01 Jun 2004
We use port redirection/proxy often on our platforms. In the production setup, separate (Linux-based) servers take care of this, but for our development and testing environment, we need port redirection for Windows system. I generally use 2 command-line packages:
No life without CURLs • 03 May 2004
If you’re a web server administrator – as I am – every now and then, someone yells at you “The site is down, fix it!”.
A tool you should always keep handy is CURL. It’s a command-line web client (multi-platform – I use it on Win2K), that allows you to see the conversation between a web server and a client (like e.g. your browser).
Let’s say if you check out a page like this: curl -I http://someserver.com/whatever, you could get
Chances are, if you are using a non-pure-Windows VPN on Windows, you’ve had an interesting few days.
In our case, we’re using a Meraki VPN server with the standard Windows VPN client,
and after the recent KB5009543 update (fixing the “Windows IKE Extension Denial of Service Vulnerability” ),
any attempt to connect to our VPN was met with the following error:
Cannot connect to [VPN name]. The L2TP connection attempt failed because the security layer encountered a
processing error during initial negotiations with the remote computer .
