Friday, September 22, 2017

Attempting to assign a certificate to the Lync Server 2013 services via the Certificate Wizard console fails and generates the error message: “Command execution failed: The process does not possess the 'SeSecurityPrivilege' privilege which is required for this operation.”

Problem

You’ve created a new certificate for your Lync Server 2013 services and attempt to assign it to Server default and Web services internal:

image

However, the assignment fails and the following error message is displayed:

Command execution failed: The process does not possess the 'SeSecurityPrivilege' privilege which is required for this operation.

image

Solution

One of the reasons why the certificate assignment would fail with the error message above is if an administrator or group policy has removed the administrators group from the Lync Server’s Manage auditing and security log policy as shown in the following screenshot:

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To correct the problem, simply grant the local administrators group the Manage auditing and security log policy permissions:

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You should be able to assign certificates to Lync Server 2013 services once the above has been completed.

Tuesday, September 19, 2017

A recent change to the SQL authentication account for an SRM database causes the VMware vCenter Site Recovery Manager Server to no longer start

Problem

You’ve recently had to reset the password to the SQL authentication account used by your VMware vCenter Site Recovery Manager to connect to the SRM database so you proceed to update the ODBC System DSN as such:

imageimage

imageimage

However, attempting to start the VMware vCenter Site Recovery Manager service fails with the following error:

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The VMware vCenter Site Recovery Manager Server service on Local Computer started and then stopped. Some services stop automatically if they are not in use by other services or programs.

image

The following event error is logged in the event logs after the failed start:

Log Name: Application

Source: vmware-dr

Event ID: 3

Level: Error

DBManager error: Could not initialize Vdb connection: ODBC error: (28000) - [Microsoft][SQL Server Native Client 10.0][SQL Server]Login failed for user 'vmware'.

image

Attempting to modify the installation of SRM will display the following error:

A database error has occurred.

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Solution

The reason why the service is unable to start is because other than updating the ODBC System DSN, you’ll also need to use one of the steps in the following KB to update the password:

Migrating an SRM server to run on a different host (1008426)
https://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1008426

The step required to get the environment in this example up is #7:

Run the installcreds.exe utility to register account credentials on the new host with the old DSN:
installcreds.exe -key db:new_SRM_DSN -u sql_admin_user
The installcreds.exe utility can be found in the bin directory of the SRM installation:
C:\Program Files\VMware\VMware Site Recovery Manager\bin

The following is an example of the executed command:

C:\Program Files\VMware\VMware vCenter Site Recovery Manager\bin

C:\Program Files\VMware\VMware vCenter Site Recovery Manager\bin>installcreds.exe -key db:SRMDR -u vmware
VMware internal use only. This program is intended for use only by the SRM installer.
Enter Password:
Installed new credentials for db:SRMDR

C:\Program Files\VMware\VMware vCenter Site Recovery Manager\bin>

image

The service should now start as the password has been updated:

image

Saturday, September 9, 2017

Update: Securing Citrix NetScaler VPX to score A+ rating on SSL Labs

Those who have used my previous blog post:

Securing Citrix NetScaler VPX to score A+ rating on SSL Labs
http://terenceluk.blogspot.com/2016/06/securing-citrix-netscaler-vpx-to-score.html

… to score an A+ on Qualys SSL Labs (https://www.ssllabs.com/ssltest/) may have noticed that they are now scoring an A- due to some minor changes to the criteria. 

There is no support for secure renegotiation. Grade reduced to A-. MORE INFO »

The server does not support Forward Secrecy with the reference browsers. Grade reduced to A-. MORE INFO »

image

The required changes to the configuration are minimal so this blog post serves to demonstrate the tweaks required to bring the score back to an A+.

The version of the NetScaler VPX I’ll be using for this demonstration is:

NS11.1: Build 49.16.nc

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Step #1 – Confirm that the SSL certificate used is SHA2/SHA256 signature

Ensure that the SSL certificate used to secure the site uses the SHA2/SHA256 signature for both the root and intermediate.

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Step #2 – Confirm that SSVLv3 is disabled and TLSv12 is enabled

With the appropriate certificate assigned begin by ensuring that SSLv3 is disabled and TLSv12 is enabled for the SSL Parameters of the virtual server:

image

Step #3 – Update Custom Ciphers

The ciphers listed in my previous post is outdated so proceed to remove the existing configuration or appending the new ciphers in, or creating a new one with the following ciphers:

TLS1.2-ECDHE-RSA-AES256-GCM-SHA384
TLS1.2-ECDHE-RSA-AES128-GCM-SHA256
TLS1.2-ECDHE-RSA-AES-256-SHA384
TLS1.2-ECDHE-RSA-AES-128-SHA256
TLS1-ECDHE-RSA-AES256-SHA
TLS1-ECDHE-RSA-AES128-SHA
TLS1.2-DHE-RSA-AES256-GCM-SHA384
TLS1.2-DHE-RSA-AES128-GCM-SHA256
TLS1-DHE-RSA-AES-256-CBC-SHA
TLS1-DHE-RSA-AES-128-CBC-SHA
TLS1-AES-256-CBC-SHA
TLS1-AES-128-CBC-SHA
SSL3-DES-CBC3-SHA

The following command can be used to create a new custom cipher with the required ciphers:

add ssl cipher Custom-VPX-Cipher

bind ssl cipher Custom-VPX-Cipher -cipherName TLS1.2-ECDHE-RSA-AES256-GCM-SHA384

bind ssl cipher Custom-VPX-Cipher -cipherName TLS1.2-ECDHE-RSA-AES128-GCM-SHA256

bind ssl cipher Custom-VPX-Cipher -cipherName TLS1.2-ECDHE-RSA-AES-256-SHA384

bind ssl cipher Custom-VPX-Cipher -cipherName TLS1.2-ECDHE-RSA-AES-128-SHA256

bind ssl cipher Custom-VPX-Cipher -cipherName TLS1-ECDHE-RSA-AES256-SHA

bind ssl cipher Custom-VPX-Cipher -cipherName TLS1-ECDHE-RSA-AES128-SHA

bind ssl cipher Custom-VPX-Cipher -cipherName TLS1.2-DHE-RSA-AES256-GCM-SHA384

bind ssl cipher Custom-VPX-Cipher -cipherName TLS1.2-DHE-RSA-AES128-GCM-SHA256

bind ssl cipher Custom-VPX-Cipher -cipherName TLS1-DHE-RSA-AES-256-CBC-SHA

bind ssl cipher Custom-VPX-Cipher -cipherName TLS1-DHE-RSA-AES-128-CBC-SHA

bind ssl cipher Custom-VPX-Cipher -cipherName TLS1-AES-256-CBC-SHA

bind ssl cipher Custom-VPX-Cipher -cipherName TLS1-AES-128-CBC-SHA

bind ssl cipher Custom-VPX-Cipher -cipherName SSL3-DES-CBC3-SHA

With the custom cipher created, ensure that the virtual server is configured to use it:

image

Step #4 – Configure Deny SSL Renegotiation to FRONTEND_CLIENT

Navigate to Traffic Management > SSL > Change advanced SSL settings:

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Change the Deny SSL Renegotiation setting from ALL to FRONTEND_CLIENT:

image

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Alternatively, the following command can be executed to change the configuration:

set ssl parameter -denySSLReneg FRONTEND_CLIENT

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-------------------------------------------------------------------------------------------------------------------------

You should now score an A+ with the adjustments listed above configured:

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Remember to save the configuration!

Thursday, August 24, 2017

Attempting to mount Exchange Server 2016 DAG database with 1 of 2 nodes down throws the error: “Error: An Active Manager operation failed. Error: An Active Manager operation encountered an error. To perform this operation, the server must be a member of a database availability group, and the database availability group must have quorum. Error: Automount consensus not reached (Reason: ConcensusUnanimity does not allow auto mount. (IsAllNodesUp: False)).”

Problem

You have two Exchange 2016 mailbox servers configured as a DAG and one server providing witness servers.  One of the mailbox server experiences an issue and goes down so the remaining mailbox server continues to service mailbox requests and has the databases mounted.  The remaining operational server is restarted and you immediately notice that the databases are not mounted after the restart: 

image

Attempting to mount the databases with the Mount-Database command throws the following error:

[PS] C:\Windows\system32>Mount-Database contoso-edb16-01

Failed to mount database "contoso-edb16-01". Error: An Active Manager operation failed. Error: An Active Manager operation

encountered an error. To perform this operation, the server must be a member of a database availability group, and the

database availability group must have quorum. Error: Automount consensus not reached (Reason: ConcensusUnanimity does

not allow auto mount. (IsAllNodesUp: False)). [Server: contoso-MBX16-01.contoso.NET]

    + CategoryInfo          : InvalidOperation: (contoso-EDB16-01:ADObjectId) [Mount-Database], InvalidOperationException

    + FullyQualifiedErrorId : [Server=contoso-MBX16-01,RequestId=ae45aaee-8113-4908-a0fd-34e3d4a032a2,TimeStamp=17/08/2017

    12:20:16] [FailureCategory=Cmdlet-InvalidOperationException] A5CACA44,Microsoft.Exchange.Management.SystemConfigu

  rationTasks.MountDatabase

    + PSComputerName        : contoso-mbx16-01.contoso.net

[PS] C:\Windows\system32>Get-DatabaseAvailabilityGroup

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Executing the Get-DatabaseAvailabilityGroup cmdlet displays the following message:

Warning: Unable to get Primary Active Manager information due to an Active Manager call failure. Error: An Active Manager operation failed. Error: An Active Manager operation encountered and error. To perform this operation, the server must be a member of a database availability group, and the database availability group must have a quorum. Error: Automount consensus not reached (Reason: ConcensusUnanimity does not allow auto mount. (IsAllNodesUp: False)).

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Executing the Get-MailboxDatabaseCopyStatus * cmdlet indicates the status of the mailbox databases in the DAG as Unknown:

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Solution

The reason why the databases would not automount and manually mounting them would fail is because the DAG has Datacenter Activation Coordination (DAC) mode enabled and this forces starting DAG members to acquire permission in order to mount any mailbox databases.  In the example above, the DAG is unable to achieve a quorum with the second node down and therefore the DAG isn’t started and databases would not be able to mount.  If you are sure that the second node is down as in the example above, you can manually start the DAG with the cmdlet:

Start-DatabaseAvailabilityGroup -Identity <DAG NAME> -MailboxServer <MailboxServerName>

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The status of the mailbox databases should now be listed from Unknown to Dismounted once the DAG has been started and issuing the Mount-Database cmdlet will now successfully mount the databases:

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The following are TechNet blog posts that provide a more in depth explanation of DAG and DAC:

Part 1: My databases do not automatically mount after I enabled Datacenter Activation Coordination
https://blogs.technet.microsoft.com/timmcmic/2012/05/21/part-1-my-databases-do-not-automatically-mount-after-i-enabled-datacenter-activation-coordination/


Part 5: Datacenter Activation Coordination: How do I force automount consensus?
https://blogs.technet.microsoft.com/timmcmic/2013/01/27/part-5-datacenter-activation-coordination-how-do-i-force-automount-consensus/

Wednesday, August 23, 2017

Attempting to export an Exchange Server mailbox to PST throws the error: “Couldn’t locate a database suitable for storing this request.”

I’ve noticed that many of my colleagues and clients have asked me about the following error that is thrown when they attempt to export an Exchange Server mailbox to PST so I thought it would be a good idea to quickly write a post about the error.

Problem

You attempt to export a mailbox to PST via the Exchange Admin Center but received the following error:

Couldn’t locate a database suitable for storing this request.

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Using the New-MailboxExportRequest feature displays a similar error:

[PS] C:\Windows\system32>New-MailboxExportRequest -Mailbox mbraithwaite -FilePath "\\tmrfp09\archive$\Outlook Archive\mb
raithwaite.pst"
Couldn't locate a database suitable for storing this request.
     + CategoryInfo          : InvalidArgument: (mbraithwaite:MailboxOrMailUserIdParameter) [New-MailboxExportRequest],
     MailboxDatabase...manentException
     + FullyQualifiedErrorId : [Server=contBMEXMB01,RequestId=c7446094-7d17-4e06-90c4-07be8ca10829,TimeStamp=8/23/2017 2
    :46:00 PM] [FailureCategory=Cmdlet-MailboxDatabaseVersionUnsupportedPermanentException] 4B192EAA,Microsoft.Exchang
   e.Management.Migration.MailboxReplication.MailboxExportRequest.NewMailboxExportRequest
     + PSComputerName        : contbmexmb01.contoso.com

[PS] C:\Windows\system32>

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Solution

The reason why this error would be thrown is if you are trying to export a mailbox that is on a different version than the admin console you are working from.  In the example above, the attempt was made from the Exchange 2016 admin center but the mailbox actually resides on an Exchange 2010 server.  Simply execute the export job from the PowerShell prompt of one of the Exchange 2010 servers to get the mailbox to export.

Tuesday, August 22, 2017

Exchange 2010 users are no longer able to connect via Outlook Anywhere while migrating to Exchange 2016

I’ve recently had to migrate a client from Exchange 2010 to 2016 and quickly noticed that Outlook Anywhere no longer worked after redirecting Outlook Anywhere and other services such as autodiscover and webmail to the new server.  Outlook Anywhere continued to work for users migrated to Exchange 2016 but not for users still on the legacy Exchange server.  Using the Remote Connectivity Analyzer (https://testconnectivity.microsoft.com/) Outlook Connectivity feature would fail and throw the following error:

Attempting to send an Autodiscover POST request to potential Autodiscover URLs.

Autodiscover settings weren't obtained when the Autodiscover POST request was sent.

clip_image001[8]

Additional Details

Elapsed Time: 1504 ms.

clip_image001[9]

Test Steps

clip_image003[4]

The Microsoft Connectivity Analyzer is attempting to retrieve an XML Autodiscover response from URL https://autodiscover.domain.com:443/Autodiscover/Autodiscover.xml for user user@domain.com.

The Microsoft Connectivity Analyzer failed to obtain an Autodiscover XML response.

clip_image001[10]

Additional Details

A Web exception occurred because an HTTP 400 - BadRequest response was received from Unknown.
HTTP Response Headers:
request-id: 0d7c484b-cdfb-42eb-bd3b-8d5b6dfb4844
X-CalculatedBETarget: exchange2010-02.domain.com
Persistent-Auth: true
X-FEServer: exchange-2016-02
Strict-Transport-Security: max-age=157680000
Content-Length: 346
Cache-Control: private
Content-Type: text/html; charset=us-ascii
Date: Wed, 16 Aug 2017 17:06:18 GMT
Set-Cookie: X-BackEndCookie=S-1-5-21-206374890-975330658-925700815-6573=rJqNiZqNgauyrbqnt7zPzdGLkJSWkJKWk5OakZGWipLRnJCSgc7GzMjGxsjGy8iBzc/OyNLPx9LOyavOyMXOycXOxw==; expires=Wed, 16-Aug-2017 17:16:18 GMT; path=/Autodiscover; secure; HttpOnly
Server: Microsoft-IIS/8.5
X-AspNet-Version: 4.0.30319
X-Powered-By: ASP.NET

Elapsed Time: 1504 ms.

I was unable to find an official Microsoft KB which described this issue but I was able to come across this blog post for migrating from Exchange 2007 to Exchange 2013:

Exchange 2013 to 2007 Outlook Anywhere Proxy Issue
https://smtp4it.net/2013/12/05/exchange-2013-to-2007-outlook-anywhere-proxy-issue/

… and I can confirm that after adding the registry keys onto the Exchange 2010 servers as such:

image

… then restarting the servers was able to correct the Outlook Anywhere problem for Exchange 2010 users during the Exchange 2016 migration:

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Wednesday, August 16, 2017

Attempting to launch a Citrix XenApp / XenDesktop 7.x application published with a NetScaler VPX fails with: “Unable to launch your application. Contact your help desk with the following information: Cannot connect to the Citrix XenApp server. Network issues are preventing your connection. Please try again. If the problem persists, please call your help desk.”

Problem

You attempt to launch a Citrix XenApp / XenDesktop 7.x application published with a NetScaler VPX:

image

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The following Citrix Receiver Remote Desktop Connection window is presented and displays the progress bar:

Starting…

More information

image

Clicking on the More information button displays:

Connection in progress…

Less information

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The progress bar does not proceed any further and the process eventually fails with the message:

Unable to launch your application. Contact your help desk with the following information:

Cannot connect to the Citrix XenApp server. Network issues are preventing your connection. Please try again. If the problem persists, please call your help desk.

image

Attempting to launch the XenApp desktop displays the launch window:

image

… but will fail with:

The connection to “XenApp Weir Desktop” failed with status (Unknown client error 1110).

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Solution

While there could be several reasons why this error would be thrown, one of the possible causes is if the Citrix session reliability port 2598 is blocked from NetScaler to application server.  Ensure that the NetScaler can access the XenApp server via TCP port 2598.