DNS isn’t always the cause of “selected objects in the following domains are not available”

So if you hit up the ‘goog, bing’d it, and everyone that asks about this error: The Active Directory Domain Controllers required to find the selected objects in the following domains are not available: contoso.com Ensure the AD Domain Controllers are available and try to select the object again …gets told that it’s their DNS….

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Why doesn’t NLA work with cross-domain smart card authentication?

Well… actually it does. But you need a trust. And by the way this will affect more than just smart card authentication to an RDP session, it will also affect copying files over UNC paths and basically anything else that requires authentication. First though, let me back up a bit and talk about Network Level…

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Performance Series | EP10, Network Congestion. How IT Pros (SHOULD) Troubleshoot Slow PC's and Servers

[View:https://youtu.be/dHwKcOGnX-M:0:0] In episode 10 we'll talk about network congestion. While the problem isn't normally on your server, I'll show you how to determine what caused the issue if it is. This episode also talks about how to spot and identify network latency. We cover perfmon and how to interpret the counters, pathping, TCPView, IO Meter…

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Performance Series | EP9, Processor Bottlenecks. How IT Pros (SHOULD) Troubleshoot Slow PC's and Servers

[View:https://youtu.be/6qkvYibxots:0:0] Episode 9, Processor Bottlenecks. Performance Series. In episode 9 we'll load a machine up to nearly 100% processor utilization and talk about how to track it in perfmon (because I know you already know how to do this with task manager). We also cover context switching, DPC's, Interrupts, and the Processor Queue Length. After…

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Performance Series | EP8, Kernel Memory Leaks. How IT Pros (SHOULD) Troubleshoot Slow PC's and Servers

[View:https://youtu.be/QmAbdekx9rc:0:0] In episode 8 we'll cover how to identify and troubleshoot memory leaks in the kernel virtual address space. I'll demo a system crash/lockup and then show what it looks like in perfmon, then expand on how to identify the offending pooltag in the kernel using poolmon.exe. We specifically focus on the nonpaged pool, the…

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Performance Series | EP7, Windows Memory Architecture. How IT Pros (SHOULD) Troubleshoot Slow PC's and Servers

[View:https://youtu.be/HTblpTHvhjY:0:0] Episode 7, Windows Memory Architecture. Performance Series.   In episode 7 we'll start talking about "Fake Memory" as I've been eluding to for several episodes. We cover the microkernel memory architecture of 32 and 64 bit operating systems, the Virtual Memory Manager, and why user mode processes sometimes crash when they exceed it. We…

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Performance Series | EP6, Dude… Where's My RAM? How IT Pros (SHOULD) Troubleshoot Slow PC's and Servers

[View:https://youtu.be/v8R1ZQQw0Bg:0:0] In episode 6 we'll finish off the RAM and Pagefile discussion, then move on to leaks of just RAM. We cover the differences between working set and private bytes counters in the process object. Then we crash our test box again by setting a process lose to go suck up all the Available Mbytes…

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Performance Series | EP5, Tracking RAM and Page File Exhaustion: How IT Pros (SHOULD) Troubleshoot Slow PC's and Servers

[View:https://youtu.be/2O2er22k7wU:0:0] Episode 5, Tracking RAM and Page File Exhaustion. Performance Series. In episode 5 we start the discussion of memory leaks. This is a topic that will span several issues. Memory can mean the virtual address space of a process or the kernel itself, or it could mean you ran out or RAM. Or, you…

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Performance Series | Episode 4, Troubleshooting Disk Bottlenecks. Performance Series.

[View:https://youtu.be/CWN2SZJr91Q:0:0] In episode 4 we cover the first of the actual counter sets used to identify problems, and the methodology to do so. Identifying a disk bottleneck involves more than just latency counters, it also includes ruling out whether your server or PC was actually the culprit. So what we will do in this episode…

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Performance Series | EP3, Loading and Interpreting Counters: How IT Pros (SHOULD) Troubleshoot Slow PC's and Servers

[View:https://youtu.be/2FKGoz5woTc:0:0] Episode 3, Loading and Interpreting Counters. Performance Series. In episode 3 we finish up with the intro to perfmon, such as how to actually load the data collector sets we captured. We then cover some of the basics of interpreting the counters (scaling graphs, scaling counters, looking for patterns, and zooming into the problem).

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