Access to video content in Mainland China which restrict the IP source should be from within the country

Unblock-Youku is an opensource project, their source code is at

Official site: , please donate if you find it is useful.

  1. The easier way is use the unblock-youku DNS server(especially good for phones and those TV boxes)

main DNS:
Backup DNS1:
Backup DNS2:

2) Use proxy server:

3) Use Chrome extension



Steps with screenshot in the official tutorial on how to use the above DNS or proxy server : (Chinese, please use Google translate)

A good site to discuss other alternative e.g. setup your free server on cloud service provider, click here (in Chinese, Google translate please click here)


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Fix windows 7 bootup issue using bootrec command

bootrec /fixmbr

bootrec /fixboot

bootrec /scanos

bootrec /rebuildbcd


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Windows 10 with Novemeber update(Threshold 2)

Windows 10 with Novemeber update(Threshold 2) download address

ver1511(Build 10586.0)


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Troubleshoot what caused AD account locked

When you as IT get reported from users that the account is locked, do the following:

  1. Go to the domain controllers, start event viewer, in windows log->security, click on “filter current log”,  enter “4625,4740” as event ID to the box called “<All event IDs> to filter those audit failure and account lockout message.
  2. Check the time when user is locked, find the entry and see the details.
  3. If you see the “workstation name” or “caller computer” is blank, or see
    “MICROSOFT_AUTHENTICATION_PACKAGE_V1_0”  there the locking is NOT from domain computers, most probably from mobile device, reason maybe using Microsoft NPS(network policy server) to authenticate wireless login, or forget to update email password in mobile device after password change.

Here is a source mentioned other causes of locking:

Extract from it:

There may be many causes for account locked out.
•user’s account in stored user name and passwords
•user’s account tied to persistent mapped drive
•user’s account as a service account
•user’s account used as an IIS application pool identity
•user’s account tied to a scheduled task
•un-suspending a virtual machine after a user’s pw as changed

For more refer KB article:

You can also install Account Lockout and Management Tool:

If user id is getting frequently locked out use the Eventcomb LockoutStatus.exe to determine which DC it is being locked out upon then examine the security log of that domain controller to determine the member server or workstatuion it is occuring on. You can then check

scheduled tasks/services to nail down or log user out of the system identified if logged in.

Does user involved has a smartphone or some kind of mobile device using AD credentials for connecting (like exchange), if it fails to connect 3 times (depending on your GPO’s), it locks his account.Have a look on all his stuff using his user account automatically, specially his mobile (90% of the time guilty).

Refer below link for more step on trroubleshooting accout lockout.

Also see reference:

Powershell script to search all DCs for the locked event.

Get-Eventlog –ComputerName ([System.DirectoryServices.ActiveDirectory.Domain]::GetCurrentDomain()).FindDomainController() “Security” -InstanceID “4740″ -Message *”USERNAME”* | Format-List Timegenerated, Message


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Understand network performance issue

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Path Maximum Transmission Unit (PMTU) Black Hole Routers

Good article explain PMTU black hole routers

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GRE tunnel


Config GRE tunnel using Cisco routers

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