Transport Layer Security (TLS) Handshake Failing, SChannel Error 36888

  Hey guys, Keith Abluton here again. I wanted to share an interesting trend that I have seen lately in some of the Schannel cases that I have worked. There has been a large uptick in TLS handshake failures. They are usually accompanied by Schannel errors that show up in the System Event Log. In…


How to Configure Data Captures for Intermittent/Sporadic SChannel Events

  Recently I have seen a large uptick in the number of SSL/TLS cases where Schannel Event IDs are logged. In some cases the event is not easily reproducible and sporadic. These are without a doubt the most challenging types of issues to diagnose and resolve. Data is needed at the time of the event…


Public Trusted Root Gives Error “The integrity of this certificate cannot be guaranteed”

    I recently worked an odd case where customer was seeing the below error on some of his certificates in the Trusted Root Certificate Authority store. This was only the case for some certificates and happened on several different Operating Systems. The customer was thinking that something had corrupted the certificates but even downloading…


Schannel Errors Event ID 36888 after installing KB3042058

    Howdy folks. Keith here with my first blog in quite a while. I am no longer supporting ISA/TMG/UAG but moved over to a new role supporting Microsoft’s implementation of Public Key Infrastructure (PKI) and along with that Secure Channel (Schannel). I am excited about the challenge and I get to see a lot…


Error While Configuring WAP–”The Underlying Connection Was Closed”–Part 2

Last week I ran into an issue that was similar in behavior to something that I covered in another previous post. I am inclined to think that we will see more calls similar to this so I thought I would take some time to show you what the cause was and how to resolve it….


Publishing SharePoint 2010 with UAG – Cannot Check Out Documents and They May Be Read-Only

  Some of the more frustrating issues I come across when supporting UAG are encountered when publishing SharePoint. It seems as though SharePoint 2010 is particularly vulnerable to oddities when publishing it through UAG or any reverse proxy for that matter.  Ben Ari has a great blog that goes a long way to explaining why…


Error While Configuring WAP–The Underlying Connection Was Closed

  We have seen a couple of these issues this week when running the Web Application Proxy wizard to complete an install. I am pretty sure we will see quite a few more of these so I thought I would write up a quick blog on the issue. Problem After installing the role for Web…


When Troubleshooting Use All the Tools at Your Disposal (Part 2)

Just this week I had another very interesting case that allowed me to really dig into some data and it took the use of multiple tools to figure it out. This blog is targeted at folks that are either new to the IT field, thinking about getting in to the field, or are always looking…


Building a Web Application Proxy Test Lab in Azure

This is Part 3 in an ongoing series that will help you take advantage of Azure by showing you how you can utilize it to test different products before deciding to roll them out. Part 1 Creating a Test Lab for Free in Azure Part 2  Configuring Your First VM in Azure In Part 2…