Archive for windows

You might not have permission to use this network resource

Sometimes I found the error to open or check network shared resources. It shows “You might not have permission to use this network resource”.

We can avoid this error by doing the following registry changes.

1. Click Start, click Run, type regedit in the Open box, and then click OK.
2. Locate and then double-click the following registry subkey:
3. In the right pane, double-click restrictanonymous.
4. Make sure that the value in the Value data box is set to 0, and then click OK.
5. Close Registry Editor.
6. Restart the computer.

Try it. Hope that it will work.


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Registry edit disabled by administrator

My pc is a member of a domain. According to group policy no domain user gets access on registry edit. It only shows the following error, while trying to registry edit.

But for emergency purpose I need to edit the registry. So, I did the following.

Run command prompt window and execute the following command.

reg delete HKCU\Software\Microsoft\Windows\CurrentVersion\Pol icies\System

And then restart the pc.

It worked. You can try yourself.

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“Undeliverable: ” on Exchange 2003

Few days ago I got a error of undeliverable message on exchange 2003.

Undeliverable error

Undeliverable error

Possible Cause:

  • The e-mail account does not exist at the organization the message was sent to. This issue may occur if there was a problem when users were moved between sites. For example, if a former Administrative_Group_1 user moves to Administrative_Group_2 and then replies to an old e-mail message, or if the user does not re-create his or her Outlook profile, an old Administrative Group style LegDN address will be used, and an NDR is generated.
  • The message was sent to obsolete personal address book entries.
  • The categorizer rejected delivery because you configured your SMTP contact with see comment SMTP RFC821 characters.

Troubleshooting: Verify the recipient address and resend the message. Verify that the recipient address is formatted correctly and that the categorizer was able to correctly resolve the recipient.

After resending to proper recipient I got the problem solved.

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An unhandled exception has occured

Few days ago I got the following error on a pc.

error message

The problem occurs because Microsoft Data Access Components (MDAC) is not installed on the computer. The .NET application uses MDAC to access the data from the database.

To resolve this problem, I installed MDAC on the computer. I downloaded MDAC from the following Microsoft Developer Network (MSDN) Web site:Data Access downloads

And now the problem is solved.

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Can not view images on MS Outlook 2003

Few days ago I got a problem on MS outlook that it could not view images. I solved the error on following way.

1. Go to run from start menu

2. Type regedit

3.Go to HKEY_USER\Software\Microsoft\Office\11.0\Outlook\Security\OutlookSecureTempFolder

4. In right pane Navigate to the value of this key %USERPROFILE%\LocalSettings\Temporary Internet Files\OLK3D where OLK3D Value change in different values

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Thayet Myo Hacking Day

2 dyas ago I found that there is some lines on desktop “Thayet Myo Hacking Day”. It was a virus/worm. It slow down the pc. I removed the virus on following way.

1.  Open My Computer, click on tools and select Folder option.

2. Go to View Tab, and select “Show Hidden files and folder” and uncheck “Hide extensions for known file system” and “Hide protected operating system files (recommended)”.

3. Start the pc on Safe mode.

4. Delete the explorer.exe files in C:\recycler, C:\Windows\Backup and C:\.

5. Open regedit and delete explorer file in hkey_local_machine/software/microsoft/windows/current version/run .

6. Restart the pc. Update the AV installed on your pc and scan whole HDD.

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Adjusting/Tuning TCP MTU for Remote Desktop Connection

Few days ago, I faced problem at remote desktop connection. I could could connect to the remote pc through RDC but it was getting hanged after logging in. Later we found that there was change at remote server at firewall. I had to change adjust the TCP MTU to 1300 to get the connection properly. To adjust the TCP MTU I had to do the following things.

To modify the PPPoE MTU size, create the following registry key:


Then add the following registry entries.

Collapse this tableExpand this table
Entry name Data type Value data
ProtocolType REG_DWORD 0x00000800
PPPProtocolType REG_DWORD 0x00000021
ProtocolMTU REG_DWORD the appropriate MTU size (in decimal)

To do this:

  1. Click Start, click Run, type regedit, and then click OK.
  2. Locate and then click the following key in the registry:
  3. On the Edit menu, point to New, and then click Key.
  4. Type Protocols, and then press ENTER.
  5. On the Edit menu, point to New, and then click Key.
  6. Type 0, and then press ENTER.
  7. On the Edit menu, point to New, and then click DWORD Value.
  8. Type ProtocolType, and then press ENTER.
  9. On the Edit menu, click Modify.
  10. Type 800, and then click OK.
  11. On the Edit menu, point to New, and then click DWORD Value.
  12. Type PPPProtocolType, and then press ENTER.
  13. On the Edit menu, click Modify.
  14. Type 21, and then click OK.
  15. On the Edit menu, point to New, and then click DWORD Value.
  16. Type ProtocolMTU, and then press ENTER.
  17. On the Edit menu, click Modify.
  18. Type the appropriate MTU size (decimal value), and then click OK.
    Tuning TCP MTU image 1

    Tuning TCP MTU image 1

  19. 19.   Browse to the TCP/IP registry keys under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parametersby expanding successive folders on the left panel and scrolling down as needed.
  20. Create a MTU value according to this.


    Key: Tcpip\Parameters\Interfaces\interfaceGUID

    Value Type: REG_DWORD—number

    ValidRange: 88–the MTU of the underlying network

    Default: 0xFFFFFFFF


    Adjusting TCP MTU at client pc image 2

    Description: This parameter overrides the default Maximum Transmission Unit (MTU) for a network interface. The MTU is the maximum IP packet size, in bytes, that can be transmitted over the underlying network. For values larger than the default for the underlying network, the network default MTU is used. For values smaller than 88, the MTU of 88 is used. I insert the MTU value 1300.

And Finally I could log in at the remote server through RDC successfully.

Actually I do not know much about this. Any comment or suggestion regarding this topic will be highly appriciated. Waiting to hear from you.

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