Thursday, June 28, 2018

AD Query still returns old user name after user name was changed at domain controller

Symptoms:

Consider the following scenario:

  1. On the domain member computer, an application calls the LsaLookupSids function to translate a security identifier (SID) to a user name.
  2. The user name has been changed on a domain controller.
  3. In this scenario, the LsaLookupSids function may return the old user name instead of the new user name. This behavior may prevent the application from working correctly.


Cause:

The local security authority (LSA) caches the mapping between the SID and the user name in a local cache on the domain member computer. The cached user name is not synchronized with domain controllers. The LSA on the domain member computer first queries the local SID cache. If an existing mapping is already in the local SID cache, the LSA returns the cached user name information instead of querying the domain controllers. This behavior is intended to improve performance.

The cache entries do time out, however chances are that recurring queries by applications keep the existing cache entry alive for the maximum lifetime of the cache entry.


Workaround:

To work around this issue, disable the local SID cache on the domain member computer as follows.

  1. In RegEdit, locate HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
  2. Create a new DWORD directly under "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa", name it LsaLookupCacheMaxSize and assign value 0.
  3. Reboot may not be required.

Note The LsaLookupCacheMaxSize registry entry sets the maximum number of cached mappings that can be saved in the local SID cache. The default maximum number is 128. When the LsaLookupCacheMaxSize registry entry is set to 0, the local SID cache is disabled.


Resources:
https://support.microsoft.com/en-us/help/946358/the-lsalookupsids-function-may-return-the-old-user-name-instead-of-the
https://marclsitinfrablog.wordpress.com/2011/06/25/lsa-lookup-cache/

Wednesday, June 13, 2018

Steps to add VS solution to Visual Studio Team Services

Steps to add an existing Visual Studio solution to a repository on Visual Studio Team Services (or Team Foundation Server).


  1. Install Git on your PC first.
  2. Create a project with Git as version control on your Visual Studio Team Services website.
  3. Get the URL of the new project after it is created,
    i.e., https://developer2201.visualstudio.com/WebApp1/_git/WebApp1
  4. Assuming your Visual Studio solution folder is C:\Dev\VS2017_Eval\WebApp1...
  5. Open command line console. Go to "C:\Dev\VS2017_Eval\WebApp1".
  6. Run command: git init
  7. Run command:
    git remote add origin https://developer2201.visualstudio.com/WebApp1/_git/WebApp1
  8. add ".gitignore" file to the folder. You can download it from github at
    https://github.com/github/gitignore/blob/master/VisualStudio.gitignore
  9. Run command: git add .gitignore
  10. Run command: git commit -m ".gitignore file added"
  11. Run command: git add *
  12. Run command: git commit -m "Initial source codes"
  13. Run command: git push -u origin --all

Step 13 can be done in Visual Studio by using Sync and Push in outgoing commit in Visual Studio, too.


Wednesday, May 23, 2018

SharePoint 2013: Include javascript and css in the MasterPage

<!--SPM:<SharePoint:CssRegistration runat="server" ID="CssRegistration1" Name="&#60;% $SPUrl:~sitecollection/Style Library/style.css %&#62;" After="corev15.css"/>-->

<!--SPM:<SharePoint:ScriptLink runat="server" ID="ScriptLink1" Language="javascript" Name="~sitecollection/Style Library/script.js"/>-->

Thursday, May 17, 2018

Sample Databases (AdventureWorks)

Various SQL Server sample databases including the AdventureWorks2012 sample databases are available at this location.

https://github.com/Microsoft/sql-server-samples/releases/tag/adventureworks

Thursday, May 10, 2018

WinAero - very useful to customize Windows 10 font size, etc

Since the last major Window 10 updates, the old way to customize the icon font size went away. The closest way to make the Windows 10 desktop icon's font size bigger is through using Settings --> Display --> Advanced Custom Scaling. However, this does not yield the desired result, because it could end up increasing the size of fonts as well as icon size and everything else on the screen in proportion.

 I did a quick Google Search and found a utility called WinAero (http://WinAero.com). This tool allows granular customization of specific items, such as icon font and icon font size. On a 14-inch screen laptop with 1366x768 resolution, being able to use 11-point, semi-bold Segoe UI font makes it really nice to use the laptop again.

Monday, April 9, 2018

CentOS 6 - Set Static IP

In order to set static ip on CentOS 6:


  1. Open ifcfg-Auto_eth0 file at /etc/sysconfig/network-scripts folder
    1. sudo vi /etc/sysconfig/network-scripts/ifcfg-Auto_eth0
      1. The file name could be different. It could be ifcfg_eth0, too.
  2. Change the content to something like below:
    1. TYPE=Ethernet
      BOOTPROTO=none
      IPADDR=192.168.11.30
      PREFIX=24
      GATEWAY=192.168.11.1
      DNS1=192.168.11.10
      DNS2=209.18.47.62
      DEFROUTE=yes
      IPV4_FAILURE_FATAL=yes
      IPV6INIT=no
      NAME=eth0
      UUID=06823066-d18a-4af3-b3a0-e2158d152465
      ONBOOT=yes
      HWADDR=00:0C:29:D3:6C:5C
      LAST_CONNECT=1523339343
  3. :wq
  4. Open resolv.conf and check or correct the nameserver
    1. sudo vi /etc/resolv.conf
    2. It should be like the following.
      1. nameserver 192.168.11.10
      2. nameserver 209.18.47.62
  5. Restart network
    1. sudo /etc/init.d/network restart




Other admins use /etc/sysconfig/network file to specify the default gateway. They may not specify DNS1 or DNS2 in ifcfg-eth0 or ifcfg-Auto_eth0 file. Instead, only the /etc/sysconfig/network file is used to specify the nameservers. 

Below is another example of setting up static ip on CentOS 6



## Configure eth0
#
# vi /etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE="eth0"
NM_CONTROLLED="yes"
ONBOOT=yes
HWADDR=A4:BA:CC:37:F1:03
TYPE=Ethernet
BOOTPROTO=static
NAME="System eth0"
UUID=5fb06bd0-0bb0-7ffb-45f1-d6edd65f3e03
IPADDR=192.168.11.30
NETMASK=255.255.255.0


## Configure Default Gateway
#
# vi /etc/sysconfig/network

NETWORKING=yes
HOSTNAME=centos6
GATEWAY=192.168.11.1


## Restart Network Interface
#

/etc/init.d/network restart

## Configure DNS Server
#
# vi /etc/resolv.conf

nameserver 192.168.11.10      # Replace with your nameserver ip
nameserver 209.18.47.62       # Replace with your nameserver ip

CentOS 6 - Change hostname

To check the host name of CentOS 6,

hostname
hostname -f

To change the host name on CentOS 6,
  1. sudo vi /etc/sysconfig/network
    1. Update HOSTNAME=[hostname.domain.com] to match the FQDN.
    2. For example,
      1. HOSTNAME=cent6.contoso.edu
  2. :wq
  3. If necessary, update /etc/hosts file for internal networking. Change the host that is associated with the IP address.
    1. sudo vi /etc/hosts
    2. change the host name as needed.
  4. Run the hostname command to change the hostname on the server. For example,
    1. sudo hostname cent6.contoso.edu
  5. Restart network 
    1. sudo /etc/init.d/network restart