showing posts tagged with 'computer'
by lunarg on January 10th 2017, at 14:42
If your ESX host has lost connection to the vCenter server, but you can still directly access the host's management, and can find nothing else wrong with the vCenter server or its network connection to the host, you may want to the free space on your ESX host.

Logs and other temporary files may have filled up one or more ramdisk partitions (e.g. when you don't have a persistent scratch partition, it gets mounted on /tmp). This can cause any of the following issues:

Connection loss between the ESX host and vCenter server;

Errors when attempting to reconnect or add an ESX host to a vCenter server;

Errors while attempting to activate or configure HA;

Other unexplainable errors...

You can   ...
by lunarg on August 16th 2016, at 14:30
Like private IP address ranges (defined in RFC 1918), there are also private MAC address ranges. These are called Locally Administered Address Ranges which are never used by devices or other vendors. MAC addresses in these ranges can be safely used, assuming they are unique within your network:





The ranges may seem odd but is explained best by this excerpt from Wikipedia:

Universally administered and locally administered addresses are distinguished by setting the second least significant bit of the most significant byte of the address. If the bit is 0, the address is universally administered. If it is 1, the address  ...
by lunarg on August 1st 2016, at 16:36
QNSM stands for Quick Network Share Mounter and is a sort of bookmark and session management tool for network mapped drives. It was specifically designed for the ICT Administrator who visits a lof of different clients and thus, visiting a lot of different network setups. This tool works regardless of remembered passwords and to which domain you belong, and there are many advantages to this "crude" tool.

NOTICE: before reporting bugs, make sure you have the latest version installed.


Advantages and disadvantages

System requirements


Version history

There are two flavours of this tool available:

The installable edition, which is the recommended version for most  ...
by lunarg on June 23rd 2016, at 14:15
A list with direct links to VMware vSphere clients. Saves you a lot of time when you need to (re)install many different versions.

VMware vSphere Client 6.0 Update 2: VMware-viclient-all-6.0.0-3562874.exe

VMware vSphere Client 6.0 Update 1: VMware-viclient-all-6.0.0-3016447.exe

VMware vSphere Client 6.0: VMware-viclient-all-6.0.0-2502222.exe

VMware vSphere Client 5.5 Update 3d: VMware-viclient-all-5.5.0-3705931.exe

VMware vSphere Client 5.5 Update 3: VMware-viclient-all-5.5.0-3024345.exe

VMware vSphere Client 5.5 Update 2: VMware-viclient-all-5.5.0-1993072.exe

VMware vSphere Client 5.5 Update 1: VMware-viclient-all-5.5.0-1618071.exe

VMware vSphere Client 5.5: VMware-viclient-all-5.5.0  ...
by lunarg on May 27th 2016, at 14:14

Found this page very useful when I had to compile some stuff for a Geode LX:

Note: this original post was from May 2007 but someone pointed out to me that the link no longer worked, in an attempt to sell me some web hosting... So... Thanks, but I'm sticking with my current hosting company.

by lunarg on April 20th 2016, at 15:47
A few steps to enable management of your Office 365 subscription using Powershell. One uses Powershell because not all configuration is available through the Office 365 Portal, and it's also useful for automation.

UPDATE (2016-04-20): updated links and information.

Download and install the Microsoft Online Services Sign-In Assistant.This is required in order to be able to sign in to Office 365.

Download and install Azure Active Directory Module for Windows PowerShell (64-bit version).Note: 32-bit users, see below.

Optionally, you can also download and install modules to manage Sharepoint Online and Skype for Business Online.

32-bit Azure AD Module
From October 20, 2014, the Azure Ac  ...
by lunarg on September 11th 2015, at 11:31

Here are the download links for the old Java SE 6, 7 and 8 installers. You can download both the JRE and JDK from these pages.

(*) For Java SE 6 and 7, you'll need to create a free Oracle account to download.

by lunarg on August 24th 2015, at 16:20
Occasionally (usually once a year), you may have to renew your SSL certificate of your Active Directory Federation Services server, used for your Office 365 Single Sign-On setup. In past versions, this was done quite easily through IIS. However, since 2012 R2 (a.k.a. ADFS 3.0), ADFS no longer uses IIS and it gets a little bit more complicated.

Outlined in this short article are the steps you need to do in order to renew or replace your SSL certificate on a Windows 2012 R2 server, running ADFS 3.0.

First, renew or request a new SSL certificate through your Certificate Authority (such as GoDaddy, Enom, etc.). How to do this depends greatly on the CA. As ADFS on 2012 R2 no longer uses IIS, yo  ...
by lunarg on August 17th 2015, at 13:25
EDIT: highlight required trailing dots + added CNAME for msoid.

If you're using a hosting provider which uses DirectAdmin for its DNS management, it may be a hassle to correctly configure DNS records for Office 365, mainly because of syntax issues. After some trial-and-error and googling, I finally managed to correctly devise the proper syntax to configure Exchange Online and Lync Online.

The set up of the entries below is a left and right field in the DNS management, safe for MX-records, which are set up elsewhere. For most services, don't forget to add the trailing . at the end of each record pointing to a Microsoft Server. Otherwise, resolving will incorrectly add your own do  ...
by lunarg on August 12th 2015, at 15:47
In an Exchange cluster with a Database Availability Group (DAG), you can easily "switch over" one, more or all mailbox databases to another node.

If you need to take a node offline, it's better to put it in maintenance mode. This will properly notify the cluster that the node is in maintenance and prevents automatic failover (of other services, if any) to other nodes.

Switchover can be done through EAC, or through the EMS (Powershell).

To switch over all mailbox databases to a server called EX2:

Move-ActiveMailboxDatabase -Server EX2

To switch over the database called DB1 to a server called EX2:

Move-ActiveMailboxDatabase DB1 -ActivateOnServer EX2

The switchover will  ...
by lunarg on July 17th 2015, at 14:01
When you create a Windows Server 2012 failover cluster, the following event may be logged in the System log:

Event ID 1222 (Microsoft-Windows-FailoverClustering)
The computer object associated with cluster network name resource could not be updated.Unable to protect the Virtual Computer Object (VCO) from accidental deletion.

When a failover cluster or a cluster role is created, a computer account (a so-called Cluster Name Object (CNO)) is created in Active Directory. Since Server 2012, these objects are flagged to prevent accidental deletion. If the main cluster resource (also a computer account) does not have the required permissions on the OU containing the CNOs (by default, this is the   ...
by lunarg on July 17th 2015, at 09:15

When restoring a database, you usually start with restoring a full backup, then any differentials, and finally the transaction logs. You set the database restore mode to WITH NORECOVERY, which allows you to perform these additional restores.

But what if you find out that there's nothing more to restore, leaving you with a database stuck in Restoring mode? Then you only need to run a single T-SQL statement:


Replace db_name with the name of your database.

by lunarg on July 13th 2015, at 16:16

Follow the chart below to successfully perform a rolling upgrade of your HA SQL Server cluster.

by lunarg on July 10th 2015, at 12:35

No_Light means there's no link on the port. Usually this indicates a problem with the physical wiring, either a faulty cable, or the TX/RX have been swapped.

No_Sync means there's a link on the port (so technically, wiring is okay), but there's a problem with the actual communication. The most common problem is a mismatch in speed on the switch port and the HBA on the other side. Your best bet would be to set the port's speed (temporarily) to auto-negotiate and see what speed is selected. If this does not work, try manually setting the port fixed to lower speeds.

by lunarg on July 9th 2015, at 10:03

RFC1918 states the following blocks of IPv4 addresses that can be used in a Local Area Network. These are "private" address ranges that do not overlap with public IP addresses.

Network/maskClassFirst usable addr.Last usable addr. A10. B (x16) C (x256)
by lunarg on July 9th 2015, at 09:31

Based on recommendations and best practices from Microsoft, and information I found here, I compiled a FSMO placement scenario for 2 domain controllers:

PDC Emulator
RID Master
Infrastructure Master
Schema Master
Domain Naming Master
Global Catalog

Also, if your domain is top-level in the AD forest, configure DC1 to sync with external time sources.

by lunarg on July 8th 2015, at 16:55

To safely remove a node from a Windows 2003 Fail-Over Cluster, follow these steps:

  1. First, using Cluster Administrator, move all roles to the other nodes in the cluster.
    There should be no more roles, including the quorum running on the node.
  2. In Cluster Administrator, right-click the node and click Stop Cluster Service. (Skip this step if it is the last node of the cluster.)
  3. Still in Cluster Administrator, right-click the node and click Evict node. This will remove the node from the cluster.
  4. Optionally, you can now remove the Fail-Over cluster components from the server.
by lunarg on July 8th 2015, at 16:36
By default, only processes that are run directly by root are allowed to load kexts. When a user (non-root) process tries to load a kext, an error is logged in system.log similar to:

Request from non-root process 'netbiosd' (euid 222) to load /System/Library/Extensions/smbfs.kext - not allowed.

You can resolve the issue by allowing the specific kext (e.g.: smbfs.kext) to be loaded by non-root processes. This is done by editing the Info.plist file that's included with the kext, usually at /path/to/kext-name.kext/Contents/Info.plist.

Open a Terminal.

Locate the kext and edit its Info.plist file.In our example, this would be the file: /System/Library/Extensions/smbfs.kext/Contents/Info.plist  ...
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:

showing posts tagged with 'computer'