Old DHCP Servers appear in the list of Authorized servers

Symptoms:

1. You may see the old server’s name still listed when you view DHCP Authorized servers

2. You may get the following error: "There is no such object on the server” when tried to unauthorized

Solution:

Remove the objects from Active Directory using ADSIEDIT:
1. Start Adsiedit.msc.
2. Open the configuration Container.
3. Expand Services.
4. Expand Net Services.
5. On the right hand side, find a record named CN=DHCPRoot
6. Right Click the CN=DhcpRoot entry and then click Properties
7. Highlight DhcpServers Attribute and click Edit
8. Highlight the entry with the old Domain name and click Remove from DHCPServers Attribute. Click OK to close DHCPServers editor’s screen
9. Once deleted the DHCPServers value will be “not set"
10. Save the change by clicking OK and close Adsiedit.
11. Restart the DHCP server service
12. run the following command: “Netsh DHCP show server” to check
13. If the servers are still listed, run the command “netsh DHCP delete server ServerFQDN ServerIPAddress”

WRT54G v5 Management Mode to recover the router by uploading a new firmware image

Symptoms:
If you encounter an irrecoverable condition with the WRT54G v5, you can use Management Mode to recover the router by uploading a new firmware image. In Management Mode, the router will have just enough functionality to load a newer firmware. You should be able to recover the router is most situations.

Solution:
1: Unplug the power cord from the back of the router.
2: Hold down the Reset button.
3: While holding down the Reset button, plug back in the power cord to the router.
4: Continue to hold the Reset button for five (5) seconds. After five (5) seconds, release the button.
5: Wait for about one (1) minute.
6: Type in the router's IP address of http://192.168.1.1 into the Address field and press the [Enter] key on your wired connected computer Browser.
7: The Management Mode - Firmware Upgrade interface should appear.
NOTE: If you accidentally enter into Management Mode, you can exit by simply unplugging the power cord from the router and by plugging it back in.
8: Click Browse and locate the firmware file.
9: Click Apply to start the firmware upgrade process.
10: Once the firmware upgrade process has successfully completed, an "Upgrade Success" message will appear to confirm that the upgrade has ended.
11:Unplug the power cord from the back of the router and plug it back in -- this will restart your router using the new firmware.


More Info: http://linksys.custhelp.com/cgi-bin/linksys.cfg/php/enduser/std_adp.php?p_faqid=3176&p_created=1131055153&p_sid=Yy2tOZTh&p_lva=&p_sp=cF9zcmNoPSZwX3NvcnRfYnk9JnBfZ3JpZHNvcnQ9JnBfcm93X2NudD0xMzMzJnBfcHJvZHM9JnBfY2F0cz0mcF9wdj0mcF9jdj0mcF9zZWFyY2hfdHlwZT1hbnN3ZXJzLnNlYXJjaF9ubCZwX3BhZ2U9MQ**&p_li=&p_topview=1

Command to Reset Winsock and/or TCP/IP

Symptoms:
After install/uninstall some program or affected by trojan, we cannot access network/internet while in the good network link status

Cause:
Some Winsock catalog missing/error

Solution:
To reset winsock:
netsh winsock reset

To reset TCP/IP:
netsh int ip reset

Both will rewrites the registry back to default state, then restart to apply

This command avaliable since windows 2000

Reset / reloaded DNS cache table

Symptoms:
If your a mobile user and commonly switch profile between many places, you could find problem while accessing some sites using URL name address but directly their IP address

Cause:
The DNS cache table still attached to old gateway network profile

Solution:
if manualy Repair Network Option doesn't work

To unload all cache:
ipconfig /flushdns

to reload new:
ipconfig /registerdns

Outlook 2007 clients receive error 0x8004010f when syncronizing the Exchange 2007 Offline Address Book

Some of solution to resolve 0x8004010f error

Symptoms:
This is what the error from the sync log from within Outlook:

12:45:53 Synchronizing Mailbox
12:45:53 Done
12:45:54 Microsoft Exchange offline address book
12:45:54 0x8004010f

Solution:
1. If you are using an Outlook 2007 client, make sure your OAB is Web Distribution enabled and the OAB files have been replicated over to the Client Access Server.

From Exchange Management Console:
- Microsoft Exchange>Organization Configuration>Mailbox>Offline Address Book
- New Offline Address Book
- Type your prefered name
- Browse Server
- Next
- Check Enabled Web-based distribution
- Add Virtual Directories
- Check Enable public folder distribution if you want to support this kind
- Right click and choose Update... wait until completly
- Right click and choose Set as Default

2. If you using Outlook 2007 Client and your server Exchange 2007 after removing last exchange 2003, you need to check is old OAB still mount to 2003 version name \Default Offline Address List rather than 2007 version \Offline Address Book. Change it from:
Microsoft Exchange>Server Configuration>Mailbox>First Storage Group>Mailbox Database>Properties>Client Settings

Under /ExchangeOAB Folder you might see 2 folder but only 1 of them .that had file oab.xml.

You can removed the old address book by running Remove-OfflineAddressBook “Default Offline Address List”

To check the result from Outlook 2007:
Tools>Send/Received>Download Address Book...

How to Configure Exchange 2007 Anti-Spam Automatic Updates

After Enabling Auto updates, we need to make sure our Exchange 2007 Anti-Spam have those updates

To check:
From cmdlet run get-antispamupdates

This show you the currently installed update version.
UpdateMode : Automatic
LatestContentFilterVersion : 3.3.8414.660
SpamSignatureUpdatesEnabled : True
LatestSpamSignatureVersion : 3.3.8611.1336
IPReputationUpdatesEnabled : True
LatestIPReputationVersion : 3.3.8611.063
MicrosoftUpdate : Configured

You can then compare that to the latest version shown at:
http://catalog.update.microsoft.com/v7/site/Rss.aspx?q=exchange+server+2007+anti-spam&lang=en

If you find that its not updated or not properly configured you need to run:
Enable-AntispamUpdates -Identity SERVER01 -IPReputationUpdatesEnabled $True -MicrosoftUpdate RequestNotifyDownload -UpdateMode Automatic -SpamSignatureUpdatesEnabled $True

Then open Windows Update to check new updates

More info:
http://technet.microsoft.com/en-us/library/aa997658(EXCHG.80).aspx
http://technet.microsoft.com/en-us/library/bb125199(EXCHG.80).aspx

Event ID: 7023 DHCP Client service does not start

Symptoms:

The DHCP Client service does not start after you upgrade a Windows 2000 Server-based domain controller to Windows Server 2003

Event Type: Error
Event Source: Service Control Manager
Event Category: None
Event ID: 7023
Date: Date
Time: Time
User: N/A
Computer: ServerName
Description: The DHCP Client service terminated with the following error: Access is denied.

Cause:
This problem occurs because the Network Service account does not have sufficient permissions to access the following registry subkeys when you upgrade to Windows Server 2003:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Dhcp

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip

Solution:

To resolve this problem, assign the Network Service account Full Control access to the following registry subkeys and subkeys under:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Dhcp

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip

http://support.microsoft.com/kb/895149