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showing posts tagged with 'computer'
by lunarg on July 7th 2015, at 16:42

Clear Cache for Google Chrome is a browser extension for Google Chrome which adds a clear cache button on the address bar. This configurable button allows to quickly and without prompting clear browser data, such as cache, cookies, history, and more.

Add to Google Chrome

by lunarg on July 7th 2015, at 14:23

HTML5 Character Entity Reference Chart:

http://dev.w3.org/html5/html-author/charref

by lunarg on July 7th 2015, at 14:21

It may be useful to know whether your Mac has a 32-bit or 64-bit EFI. This can be done by running the following command from an OSX Terminal (can run from the installer or recovery partition):

ioreg -l -p IODeviceTree | grep firmware-abi

This should return something like the following:

• For 32-bit EFI:  | | "firmware-abi" = <"EFI32">
• For 64-bit EFI:  | | "firmware-abi" = <"EFI64">
by lunarg on July 7th 2015, at 12:23

MacPostFactor 1.0.1 has been officially released:

Download (direct link)

MacPostFactor is a tool to install Mac OSX 10.8+ on older (Intel) Macbooks that only support up to OSX 10.7 (Lion). It works through a combination of a highly customized installer, a replaced set of drivers and various frameworks, and the original install app from the App Store. The installation can be done directly on a Macbook already running OSX Lion (so no USB disk required), or on an USB media for installation on another system.

by lunarg on July 7th 2015, at 11:54
When you enable the ESXi Shell or SSH on a particular host in a vSphere cluster, a warning will appear on a ESX host:

ESXi Shell for the host has been enabled

or SSH for the host has been enabled

This is normal behaviour, but you can turn off these warnings for each of the hosts.

Note that prior to vSphere 4.1 Update 2, it is not possible to suppress the warnings.

Open vSphere Client.

Select the ESX host. From the Configuration tab (right pane), click Advanced Settings.

Navigate to UserVars → UserVars.SuppressShellWarning.Set its value to 1.

Click OK to confirm. The warning will disappear immediately.

Log on to vSphere Web Client.

Select vCenter from the Home menu. Select Host  ...
by lunarg on July 3rd 2015, at 15:46
Active Directory uses Kerberos for authentication, which relies strongly on having the date and time of day running synchronously across the entire network and all devices in it. By default, each server and client joined in the AD, including domain controllers, will follow the domain hierarchy to sync its time. Domain controllers are set to automatically determine whether they can be used as a (reliable) time source. If a DC has considered itself as a time source, it will accept requests from clients and provide them with the its own current time.

Domain controllers at the top of the forest (top-level DCs) don't have another server above them to sync against, so they can either opt to sync   ...
by lunarg on July 3rd 2015, at 15:39
The vSphere Web Client may display the following error:

Failed to verify the SSL certificate for one or more vCenter Server Systems: https://vCenter-Server-FQDN:443/sdk

or

Could not connect to one or more vCenter Server Systems:https://vCenterFQDN:443/sdk

Additionally, objects such as hosts or VMs are not displayed in the vSphere Web Client.

These errors usually occur with a re-installation or upgrade of vCenter Server, where the vCenter Server is registered to the same vSphere SSO more than once.

The faulty registration needs to be resolved by unregistered all duplicate vCenter Server instances from vSphere SSO, so only the correct registrations remain.

You will have to unregister al  ...
by lunarg on July 2nd 2015, at 13:29
Contacting a domain controller in Active Directory is done through DNS lookup. Several DNS SRV records are used to find domain controllers in a site. If multiple domain controllers are present in the same site, the client will arbitrarily select one, based on the contents of those records.

By default, the selection is random, and all DCs have an equal change of being picked. The inherit properties of SRV-records allow for this behaviour to be influenced, by changing the weight and priority of those records. This enables fine-tuning and configuration of which DC to favour or even exclude. By default, all SRV records (thus, all DCs) have their weight and priority set to 0.

The weight defines  ...
by lunarg on June 30th 2015, at 15:15

Recent models of Mac boot up with a black boot screen and white Apple logo, instead of the old gray and dark gray boot screen. DarkBoot enables older Mac systems to get the black boot screen as well. For newer Macs, the app can also change the boot screen back to the traditional gray color.

  1. Download latest release of DarkBoot.
  2. Unzip and run the DarkBoot app.
  3. Select the desired color, then click OK.
    You will be prompted for the admin password. Enter it and press OK.
  4. Reboot twice for changes to take effect.

Known to work with OSX 10.10 and 10.11 DP.

by lunarg on June 29th 2015, at 17:15

MacPostFactor 1.0 has been officially released:

Download (direct link)

MacPostFactor is a tool to install Mac OSX 10.8+ on older (Intel) Macbooks that only support up to OSX 10.7 (Lion). It works through a combination of a highly customized installer, a replaced set of drivers and various frameworks, and the original install app from the App Store. The installation can be done directly on a Macbook already running OSX Lion (so no USB disk required), or on an USB media for installation on another system.

by lunarg on June 29th 2015, at 17:14
Users that have access to a number of shared mailboxes in their Outlook may notice the contents of those shared mailboxes are no longer synchronized properly. Their own personal mailbox does not seem to have this problem. On the server running the Exchange Information Store (MSExchangeIS), a variation of the following event is logged when this occurs:

Event ID 9646
Mapi session "ba765653-5439-437a-993f-806575b85fbb: /o=My Company/ou=First Administrative Group/cn=Recipients/cn=user" exceeded the maximum of 500 objects of type "objtFolder".

The reason for this error is that the Outlook client has hit the maximum number of MAPI connections allowed for the specified object   ...
by lunarg on June 29th 2015, at 13:00
Microsoft's recommendations for customizing the default start screen for new users are known to be somewhat over-complicated and perhaps difficult to implement. They involve editing the reference image, using unattend.xml, or some other elaborate procedure. There's also the posibility of using a group policy to provide users with a customized start screen, but while this is relatively easy to implement, it does not allow the user to change the layout afterwards.

Fortunately, there's a far easier method, involving two Powershell cmdlets that provide us with a very easy way to provide new users with a default customized start screen, but still allow the users to make changes to it. This metho  ...
by lunarg on June 26th 2015, at 14:50

Microsoft has released the Azure Active Directory Connect to the general public. Azure AD Connect replaces (although "incorporates" is a better word) DirSync as the new tool to set up synchronization between your on-premise Active Directory and Azure Active Directory, including Office 365.

The current version of Azure AD Connect is only the beginning. Microsoft has announced a lot more features, which will be made available in the next versions.

More information and installation resources: https://azure.microsoft.com/nl-nl/documentation/articles/active-directory-aadconnect/

by lunarg on June 26th 2015, at 12:01
When attempting to trigger an AD replication from one DC to another using Active Directory Sites and Services or repadmin.exe, you may get the following error:

AD Replication error 8452:
"The naming context is in the process of being removed or is not replicated from the specified server."

The most common cause for this error is that you tried to replicate between DCs for which no DS replication connection exist. The replication attempt will therefore fail. As a workaround, try replicating to the target DC from another source DC. Or, create a new replication connection between the target and source DCs.

Open Active Directory Sites and Services.

In the tree to the left, locate t  ...
by lunarg on June 26th 2015, at 11:25

Active Directory (AD) integrated DNS zones are not replicated by the DNS server, but replicates through the Active Directory replication mechanism, and uses the same settings for AD replication.

You can trigger replication through Active Directory Sites and Services, or with repadmin.exe on command prompt:

repadmin.exe /replicate target_dc source_dc DC=DomainDnsZones,DC=domain,DC=com

Replace parameters accordingly:

  • target_dc is the DC to replicate to
  • source_dc is the DC to replicate from
  • Edit the naming context so it includes your FQDN: e.g. contoso.co.ukDC=contoso,DC=co,DC=uk
by lunarg on June 26th 2015, at 10:13
The NTP Pool project is a pool of publicly available time servers, all volunteers. Time servers in the pool are usually stratum 1 or 2 servers. Although the pool consists of NTP servers worldwide, it is divided into geographical location so users can pick from a pool of time servers closest near their geographical position. The pool is probably the most used pool of NTP servers.

Using servers from the pool uses DNS load balancing to randomly assign one or more servers to synchronize to. Up to four different servers can be used. To avoid DNS caching from taking the same server more than once, additional DNS records have been created in the form of:

number.geolocation.pool.ntp.org

number be  ...
by lunarg on June 25th 2015, at 16:46
When attempting to send an e-mail, you get a non-delivery report containing the following error code:

[0x80070005-00000000-00000000]

Usually, this error is caused if you are sending mail on behalf of someone else, and don't have permission to do so. Note that send on behalf and send as are two different, exclusive permissions. Having one permission does not automatically allow the other.

In rare cases, this error can also occur when a user's mailbox has been migrated to Exchange 2013, and the shared mailbox is still on the old Exchange server. This causes problems with permissions, and can quickly be resolved by setting the required permissions on the shared mailbox (send as/on behalf), t  ...
by lunarg on June 25th 2015, at 09:07

During start up or log on, once in a while, you'll see a message just saying Please wait. To turn this message into a more useful message, you can enable verbose messages through a policy setting (local or GP):

Either through gpedit.msc, or, if you're in a domain, through a GPO, navigate to Computer ConfigurationAdministrative TemplatesSystem. Look for the setting Display highly detailed status messages and set it to Enabled. Reboot to apply the change.

by lunarg on June 24th 2015, at 15:16
For proper troubleshooting of DHCP traffic, it may sometimes be necessary to capture live data on your network. There are a lot of ways on how this is accomplished, so I won't go into too much detail on all the methods available, nor will I explain what DHCP does or how it works.

DHCP (Dynamic Host Configuration Protocol) is used for automatic configuration of a host's network settings, such as IP address, gateway, routing, and more. It works by sending broadcasts using IP/UDP on ports 67 (servers) and 68 (clients). For more information on DHCP, read the explanation on Wikipedia.

In order to capture DHCP traffic, we would then have to monitor packets specifically on port 67/udp and 68/udp.  ...
by lunarg on June 24th 2015, at 13:07
With dcpromo.exe now being deprecrated on 2012 and 2012 R2, it is no longer obvious which method to use to demote a domain controller. Although you could resort to Powershell to get it done, there's also a way to demote using Server Manager, albeit not a very clear one.

The trick is to attempt to remove the Active Directory Domain Services role from the server, using Server Manager. When you do remove this, you will be prompted to demote the domain controller before the role can be removed, along with a link to actually perform this task.

Start Server Manager. In the upper right corner, click Manage, then click Remove Roles and Features.

Continue in the wizard that appears, making sure th  ...
showing posts tagged with 'computer'
 
 
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