How to allow only traffic from your Elastic load balancers to access your web servers on Amzon EC2

I wanted to modify a security group on some web servers that were behind an elastic load balancer so that they would only accept traffic from the load balancers. The problem was that  I wasn’t sure what IP address or security group to allow. As the IP would change all of the time, you just need to allow this built-in group as the source for your port: amazon-elb/amazon-elb-sg.

This will just permit YOUR load balancers to reach your webservers on your chosen ports such as 80 and 443, and you will notice that it will be renamed in the amazon console to something like this amazon-elb/sg-x00xx000 (amazon-elb-sg) .

How to fix an issue where you cannot connect to a Hyper-V host from the Hyper-V guest operating system

I had an issue where we built 6 Hyper-V Windows 2008 virtual machines with IIS that needed to connect to an SQL database that was on the Hyper-V host system.

We could not make the connection from the websites, nor could we ping or telnet to the Hyper-V host. The Hyper-V guests could ping and connect to any other system on the network, and the Hyper-V host could be connected to by any other system on the network.

The issue ended up being that we had used network teaming on the interfaces that hosted the virtual network for the Hyper-V guest operating systems.  Hyper-V does not support network teaming, so we removed the network team, and the software and just used one of the physical network interfaces to create the Hyper-V virtual network.

Connectivity was restored after removing the network teaming configuration and then teaming software, and then rebooting the Hyper-V host server.

How to fix "ASDM history is disabled" when trying to view history on a Cisco ASA

I was logged into the ASDM for a Cisco ASA the other day and I wanted to view how much traffic was coming in and out of the device, but I could only view the real time data. When I clicked on any of the other available time periods, I got the  following error “ASDM history is disabled“.

The way to fix this is:

Go to the configuration tab of the ADSM.

Go down to advanced.

Click on History Metrics.

Tick the ADSM History Metrics box

Click apply

Don’t forget to save the settings to flash memory!

How to fix "Property Owner is not available for Database 'YOURDBNAME'. This property may not exist for this object, or may not be retrievable due to insufficient access rights."

A user had created a database on an SQl server, then when that user left the company,there account was removed from the system, leaving the database with no owner!

When you right click on the database to get the properties, you get the following error:

Cannot show requested dialog.

Additional information:

Cannot show requested dialog. (SqlMgmt)

Property Owner is not available for Database ’[YOURDATABASENAME ]’.  This property may not exist for this object, or may not be retrievable due to insufficient access rights.


 The way to fix this is to assign a new owner by running the following query:




EXEC    sp_changedbowner “YOUR USERNAME”


How to fix "AccountRight Enterprise must terminate. Termination code: 1233 error" problem

A user crashed out of  MYOB AccountRight Enterprise the other day and when they tried to go back in, got the following error: 

 AccountRight Enterprise must terminate.

 Termination Code: 1233 error

  Important Details: Error -3000 in DMBegin transaction (5033:7020:4).

I asked another user to open the same file, but they also got this error.

This message means that the file is corrupted, so you can either restore from a backup, or run the “optimisation assistant” tool from the MYOB Tools menu from within the start menu.

This will run a repair and optimisation of the file and takes a few minutes depending on the file size.

How to fix "An authentication error has occured (Code: 0x8009030e) " error when trying to connect to a Hyper-V guest on Windows 2008 using the Hyper-V Manager

I was trying to open up a guest in the Hyper-V Manager console and I got the following error:
“An authentication error has occured (Code: 0x8009030e) ”
I then tried to open a few other guests and got the same error. I restarted the Hyper-V Manager, but had the same problem.
The simple fix is to log out of the server, then log back in and you will be able to open the guests again.
This happens if you are usually disconnecting from the host, rather than logging in and out each time as the credentials become stale.