Remko Weijnen's Blog (Remko's Blog)

About Virtualization, VDI, SBC, Application Compatibility and anything else I feel like

Archive for October, 2007

How to get Client IP Address?

When a client is connected to a Terminal Server Session you can use the Terminal Server API to retrieve the client’s local IP address.

Start by enumerating all sessions with WtsEnumerateSessions and then for each session get the ClientAddress with a call to WTSQuerySessionInformation with the WTSClientAddress parameter. Sound simple, no?

WTSQuerySessionInformation returns a pointer to a WTS_CLIENT_ADDRESS structure. You need to know that the IP address is located at on offset of 2 bytes in the Address member of WTS_CLIENT_ADDRESS.

So here’s a sample:

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New Terminal Server API’s in Vista SP1

The upcoming Vista SP1 promises 3 new Terminal Server API functions:

If you look in the Windows 2008 beta you can see that the functions are already implemented (in WtsApi32.dll):

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Script to clear SQL Transactions logs

Script to clear SQL Transactions Logs

Did you know that when you backup a SQL database with Backup Exec (with the SQL Agent) the transaction log is not cleared? This means that if you use the full recovery model your transaction log keeps growing and growing. I tested this with Backup Exec v11D and you can only create a seperate scheduled job to backup the transactions logs but not one to just clear it or truncate it after successfull backup.

Therefore I made a VBS script that clears SQL transactions logs, an option would be to schedule this as a post backup job.

This is the script:

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RDP Clipboard Fix

Did you ever loose Clipboard functionality (copy/paste) while working with several Terminal Server sessions? I think everyone that works a lot with Terminal Server has experienced this from time to time.

It’s caused by badly behaving applications. Dimitry Vostokov wrote a tool to fix this issue for Citrix (RepairCBDChain.exe), he explains the issue very well on his blog:

Windows has a mechanism to notify applications about clipboard changes. An application interested in such notifications has to register itself in the so called clipboard chain. Windows inserts it on top of that chain and that application is responsible to propagate changes down the chain:

rc1.JPG

If 3rd-party application forgets to forward notifications down then we have a broken clipboard chain and clipboard changes are not sent via ICA protocol:

Read more at Dimitry’s Blog: http://citrite.org/blogs/dmitryv/2006/12/09/clipboard-issues-explained/

So how can we fix this for Terminal Server then?
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TSAdminEx

You will probably know Microsofts Tool to Manage Terminal Server, it’s called Terminal Services Manager (you will probably know it as TSAdmin). It can be used to view information about terminal servers including all sessions, users, and processes for each terminal server.

TSAdmin Screenshot

I’m currently working on a TSAdmin replacement (codename TSAdminEx). Purpose is to show how to use the Terminal Server API’s and as a little bonus we will add some extra functionality to TSAdminEx.

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How to launch a process in a Terminal Session

This is an often asked question but the solution is simple:

So how does it work?
First we obtain the user’s primary access token with the WtsQueryUserToken  API call. To call this function successfully, the calling application must be running within the context of the LocalSystem account and have the SE_TCB_NAME privilege (LocalSystem has this privilege by default). Since the function returns a primary acces token we can just pass this to CreateProcessAsUser and voila!

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A referral was returned from the server

Ever tried to run a VBS scripts that queries Active Directory in another domain or from a workstation that is not a domain member? Than you have probably seen this error before:

Error MessageError MessageError Message

This is because the default settings for Chasing referrals is set to ADS_CHASE_REFERRALS_NEVER.

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How rdp passwords are encrypted

mstsc icon Ever wondered how mstsc saves passwords? If you open an RDP file with a text editor like Notepad you can see the encrypted password. In this article I will show you how to encrypt and decrypt these passwords. Besides password recovery this enables you to create rpd files programmatically or perhaps update the password in many rdp files with a batch file.

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Launch RDP from commandline

Command Prompt IconA little while ago I wrote a little commandline tool that starts an RDP connection (with mstsc.exe) because mstsc doesn’t allow you to use the login credentials (username, password) as commandline arguments.

Arguments are:

  1. Servername (string)
  2. Port (integer, usually 3389)
  3. Username (string)
  4. Domain (string)
  5. Password (string)
  6. Console (integer, specify 0 for false and 1 for true)
  7. RedirectDrives (integer, specify 0 for false and 1 for true)
  8. RedirectPrinters (integer, specify 0 for false and 1 for true)

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Atheros AR5007EG – Bad WLAN performance

A friend bought a new Toshiba Satellite L40 laptop which came with Windows Vista preinstalled. The wireless connection (via the built in Atheros AR5007EG card) was very unstable and sometimes unable to connect to the access point. When connected internet speed was very slow, sometimes unable to open pages at all. First we tried replacing the preinstalled Toshiba drivers with the latest from the Toshiba site and later on the most recent from Atheros (which can be found here).  Both drivers didn’t improve the speed.  
Solution:

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