Wednesday, 16 November 2016

Windows cannot verify the digital signature for this file.


Windows cannot verify the digital signature for this file. A recent hardware or software change might have installed a file that is signed incorrectly or damage, or that might be malicious software from an unknown source.

Solution 1:
1. Restart computer and boot into Advanced Boot Options.
(For Windows 7 press F8. For Windows 8 and 10, hold the Shift key and press restart)

2. Select Disable Driver Signature Enforcement

Windows 7

Windows 8/10

Wednesday, 9 November 2016

Increasing the disk space for the VMware vCenter Server Appliance in vSphere 6.0

1. Open console from vCenter Server. (You also can use SSH to connect)
2. Press Alt+F1 switch to console mode. (To switch back normal mode, press Alt+F2)
3. Enter username and password.

4. Use command below to enable Bash Shell.
    shell.set --enabled true
5. Use the command below to enter Shell mode.

6. Use the command below to list the disk space
    df -h

Example: If  /dev/mapper/log_vg-log  in low disk space,  I going to increase the disk.

7. Use the command below to list the disk partition.

 Example: log_vg-log is under sde partition.

8. Use the command below to identify the disk controller.

Example: sde in under 0:4 disk controller.

9. Use the vSphere Client or vSphere Web Client to increase the VM disk.
Example: 0:4 disk controller is Hard disk 5. (Hard disk 5 = /dev/mapper/log_vg-log)

 10. Use the command below to extend the newly added disk space.
       vpxd_servicecfg storage lvm autogrow
       If successful, result will show VC_CFG_RESULT=0

 11. Use the command below to check the disk space.
      df -h

Example: /dev/mapper/log_vg-log successful increase to 15GB.

Monday, 21 September 2015

#SCCM 2012R2 - Determine SCCM 2012 CU version

1. Launch registry, navigate HKLM\Software\Microsoft\SMS\Setup
2. On right panel, check on CULevel.

or Power Shell 
  • Get-ItemProperty -Path HKLM:\SOFTWARE\Microsoft\SMS\Setup -Name "CULevel"

CULevel value is (0). Mean no CU installed.

#SCCM 2012R2 - Software Update Point unable to connect WSUS

Error: System.Net.WebException: The request failed with HTTP status 404: Not Found.~~   at Microsoft.UpdateServices.Administration.AdminProxy.CreateUpdateServer(Object[] args)~~   at Microsoft.SystemsManagementServer.WSUS.WSUSServer.ConnectToWSUSServer(String ServerName, Boolean UseSSL, Int32 PortNumber)

Event ID: 6703

1. Verify the WsusPool is Started. (Under Application Pools)

2. Verify WSUS port number correct. 
Default port for WSUS Windows 2012, 8530
Default port for WSUS Windows 2008, 80

Tuesday, 15 September 2015

#Exchange 2013 - Exchange server exist in AD schema

Error: The Exchange Server is in an inconsistent state. Only disaster recovery mode is available. Please use Setup /,:RecoveryServer to recover this Exchange server.

1. Log in to AD. Open ADSI Edit, connect AD with configuration.

2. Navigate to Configuration[Domain name] --> CN=Configuration,DC=Domain name,DC=Domain name --> CN=services --> CN=Microsoft Exchange --> CN=Domain name --> CN=Administrative Groups --> CN=Exchange Administrative Group --> CN=Servers.
3. Delete the exchange server with the error above. (example: CN=DO-EXCH)

Thursday, 10 September 2015

#Web application proxy - ADFS Proxy unable to connect second ADFS Proxy server

Enter credential adfs proxy fail.

Ensure that remote management is enabled on the selected server, and then enter the name and password of an account that has administrator rights on that server. For example, or domain\user name.  


1. Add 2nd proxy server to 1st proxy server in server manager.
Follow here 

Monday, 7 September 2015

#O365 - Mailbox can't create on portal

Warning - This user's on-premises mailbox hasn't been migrated to Exchange Online. The Exchange Online mailbox will be available after migration is completed. 

Cause: This is because the user have on-premise Exchange mailbox or/and haven't migrate the mailbox to cloud.


Hybrid mode migration

1. Migrate the mailbox from on premise to cloud.

Direct cut over mode (greenfield)

Delete the user from O365.

1. Move the user out from the sync OU to non-sync OU on AD users and computers.
2. Resync the DirSync.
3. Make sure the user show under deleted users.
7. Force to clear the deleted users on O365.
    Refer to this link.

8. Make the user under Deleted Users was deleted.

Remove the Synchronization of the user attribute to Office 365

1. Open Synchronization Service Manager (miisclient.exe)
2. Click on Management Agents tab, right click Windows Azure Active Directory Connector, select properties.
3. Click on Configure Attribute Flow, 
4. Expend Object Type: User and Object Type: Group, search and locate for msExchMailboxGuid.
5. Select the mapping and delete.
6. Select Select Attributes, search and uncheck the msExchMailboxGuid.

7. Click OK to save the changes.
8. Repeat the step 3-7 for Active Directory Connector Agent. (for step 4, expand Object Type: UserObject Type: Group and Object Type: inetOrgPerson, search and locate for msExchMailboxGuid.)
9. Move back the user from non-sync OU to Sync OU.
10. Resync the dirsync.

If all users cannot create the mailbox, you might need to remove all the users from deleted users, and then reysnc all the user again from on-premise AD.