Attempt to remove glue record on delegated zone crashes DNS console

- Windows 2008 R2
- 2 domains, parent-child
- 2 DNS zones respectively. Child zone delegated from parent zone
- Connect to parent DNS server, wrong IP listed for a name server in delegated zone properties window
- When try to remove or edit it, after confirmation, the MMC freezes

There are a few other people had same issue, seems to be a bug as far as I see it.

Resolution:
- ADSIedit, connect to parent DNS server
- Drill down to the delegated zone node
- In right hand pane, find the name server in question, remove the wrong IP from "dnsRecord(?)" attribute (you have to change the view to be "decimal" to see which entry is the wrong IP.

Largest Delta? What is it?

Repadmin /repsummary result is simple, but yet somewhat confusing. A few notes:

• If you don't specify /bysrc or /bydest, it will list status for both directions. You want to pay attention to Destination DSA as AD replication is pull-based.
• Most critical column is "fails". If there is no fails, obviously you don't have much to worry about
• Most confusing column is "largest delta". It's common misunderstanding (on the Net at least) that value in this column should be less then 1hr. However, depending on how large your AD environment is, and how frequent changes happen in a particular Naming Context, value in this column could be very large (days)
• Microsoft's official interpretation for "largest delta": longest replication gap amongst all replication links for a particular DC", which is not really helpful. I personally had hard time to understand this interpretation itself.
• This value is for the particular DC, among all its replication partners, the longest time that it hasn't replicated anything against whatever NC. This value has to be read together with /showrepl command against that DC.

Read on for example:

How to troubleshoot account lockout issue

[Note] Event ID applicable to Windows 2003 DC only, but it shouldn't be too difficult to find related W2k8 event IDs.

Please read the differences between "Account Logon/logoff" event and "Logon/Logoff" event first.

- First, using lockoutstatus to find out initial authenticating DC (more than often PDC is not the initial authenticating DC. It has same event IDs mentioned below merely because other DCs check with PDC for latest password.) and time of logon attempt

- Then go to authenticating DC, check security log. Pin-point the log entry using time identified by lockoutstatus

- We are looking for: event ID 675 (4771 in w2k8?), the client IP is the offending machine that sent bad pwds

- Failure code in event ID 675(This is corresponding kerberos error code, full list here)

• 0x18: original wrong password
• 0x12: this will be logged after the fact that account has already been locked

- Logon type in event ID 675 ( full list here)

• 2 being interactive
• 3 network
• 5 service
• 10 Remote interactive

Powershell: Predefined Variables

Also called Automatic Variables.

Get-help about_automatic_variable

Time service commands

Config a manual time source

w32tm /config /manualpeerlist:peers /syncfromflags:manual /update 

Replace "peers" with a list of time servers, delimited by space, enclosed with double quotes.
Ignore KBs that maually set registry entries
Config a manual time source as the top time source in forest

w32tm /config /manualpeerlist:peers /syncfromflags:manual /reliable:yes /update

Detect time difference

w32tm /stripchart /computer:TimeServerName /samples:n /dataonly

Set server to use domain hierarchy

w32tm /config /syncfromflags:domhier /update

After change time settings, it's normally required to restart time service

If there is time difference, it takes time for the  system to bring the difference down depending on how much correct can be made in one step. The change is gradual.

Token Size vs. Paged Pool - draft

This is mostly a complete copy from microsoft.com

When users access a resource using Windows authentication and authorization (for example logging on to a workstation or accessing a file share), an “access token” is built to represent that user.
      The number of SIDs (representing group membership, etc) in that token largely determines how much kernel memory space (Paged Pool) is required to store each copy of the token.
      These allocations follow a “stair-step” pattern, as follows:
      At approximately 84 SIDs, allocation jumps from 4KB to 8KB.
      At approximately 177 SIDs, allocation jumps from 8KB to 12KB.
      At approximately 270 SIDs, allocation jumps from 12KB to 16KB.
      At approximately 363 SIDs, allocation jumps from 16KB to 20KB and so on.

Programer's Font On Windows 7

I've been looking for a font on Windows 7 that's good for scripting. The two main requirements are:

1. It has to be fixed width (monospace) (of course!);
2. It can easily let you tell the difference between a 0 (zero) and an O (as in Oops!)

There are a lot nice fonts but filtered by above two criteria and native to Windows 7, it comes down to Consolas.

2011 Microsoft Scripting Game - Advanced Leader Board

I was recently in the Scripting Guy 2011 game advanced group and placed 32nd overall. Not too bad :-) considering I didn't have enough time to finish all scripts (I've done 8 out of 10), neither did I have time to polish my scripts which costed quite a few points :-(. Nevertheless it's a great experience. I learned a lot new PowerShell techniques along the way!

2011 Advanced Group Final Leader Board

Using System Namespace In Powershell

There are many cool pre-defined constants, functions, methods, and etc. in System object. One would normally learn individual ones through sample scripts, but really should browse the MSDN page to explore what System namespace has to offer. Goto a class/structure/enumeration that you are interested, then pay special attention to those static members.

A few examples:

[System.DateTime]::Today  versus [System.DateTime]::Now
[System.String]::Empty
[System.Console]:: almost everything are static, not surprisingly
[System.Math]::PI

There are also a bunch of other namespaces, please see .Net Framework Libraries

Local Admin Account vs. account lockout

You can't really lock out an admin account - as long as you type in the correct password on *local console*, the system will unlock it automatically. This makes sense - legit users need a way to get into the system when all other credentials are failed - completely locking out all users surely won't make happy customers.

However this increases the risk of being cracked by brutalforce method. For companies who want to maximize the security and are willing to pay the cost of losing acceess due to lost passswords, there is a way to put admins under same lockout policy as ordinary users. MS has an old tool called passprop.exe that can enforce lockout policy, even against admins.

        passporp /adminlockout

This is no longer needed in Windows 2008. There are pre-define security polices in Windows 2008 will do the same.

LDAP search can't find secondary email addresses

You can search primary address using filter like (mail=JohnDoe@foo.com), but similar filter (proxyAddresses=johnDoe@foo.com) won't return anything. This is because attribute "proxyAddresses" holds not only smtp addresses, but also other types, e.g. RightFax, X.25, as well. To search secondary smtp addresses, you need to define a filter like this

(proxyAddresses=smtp:johnDoe@foo.com)

Java JDNI Authentication Against AD

Keep in mind that some of the mechanisms require the user's password stored in reversible format and password be reset.

JNDI, Active Directory and Authentication (Part 1) (Kerberos)
http://forum.java.sun.com/thread.jspa?threadID=579829&tstart=300

JNDI, Active Directory & Authentication (part 2) (SSL)
http://forum.java.sun.com/thread.jspa?threadID=581425&tstart=50

How LDAP Error Codes Map to JNDI Exceptions

LDAP Status Code Meaning Exception or Action
0 Success Report success.
1 Operations error NamingException
2 Protocol error CommunicationException
3 Time limit exceeded. TimeLimitExceededException
4 Size limit exceeded. SizeLimitExceededException
5 Compared false. Used by DirContext.search(). Does not generate an exception.
6 Compared true. Used by DirContext.search(). Does not generate an exception.
7 Authentication method not supported. AuthenticationNotSupportedException
8 Strong authentication required. AuthenticationNotSupportedException
9 Partial results being returned. If the environment property "java.naming.referral" is set to "ignore" or the contents of the error do not contain a referral, throw a PartialResultException. Otherwise, use contents to build a referral.

What Certificate Authorities You (Are Forced to )Trust and Why

In our real life, any identity issuing agency gets their power from government that people elected. You can't just claim you can/want to issue identity certificates because nobody is going to trust what you issue.

Then why the heck that there are so many "trusted" root CAs in our operating systems that we didn't endorse? In other words we are forced to trust some companies that we didn't elect. How did those CAs get their "trusted" status?

The answer is that it's Microsoft who decides what CAs it wants to add into its Windows trusted list. They have a program called "Microsoft Root Certificate Program". As long as you meet MS' requirements, you can apply and (hopefully) get the same status as big guys as VeriSign, Thawte, etc.

Not surprisingly, you can expect that other main stream OSes/browsers have same kind of programs.

Some may argue that why should Microsoft make the choice on their behalf. Well, if you decided to use Windows, you, intentionally or unintentionally, decide to trust whatever Microsoft put on the system anyway, don't you? We can only trust that Microsoft's verification program will do their job.

Want to know who is in the list being trusted? Please see KB931125

Access denied when open a network drive

When openning a network drive, what is the difference between double clicking the driver letter versus typing the letter in address bar then enter? No really you would think.

I was troubleshooting a ticket where a user got "Access Denied" by double clicking in the meantime using address bar worked just fine. Needless to say, permissions are all correct on the netwokr share. It's just how you access it. The issue follows the user so I looked up and down in the user's properties in AD and group policies but failed to find anything.

It turned out it was caused by a little file, autorun.inf, under the root of that network drive. By double clicking the system tried to run it and it required something that this user didn't have permission to. Removing the file resolved the issue!