Mass remote changing of DNS-servers in network interface (NIC) settings in Windows

During upgrade of domain controllers or theirs addition\removal in Active Directory domain, there is always a need to change DNS-servers in network interfaces settings in Windows. On those computers or servers where you set network settings with DHCP - there is no problems. But on those where you configure settings manually, you will have to change them manually also. It is long and inconvinient.

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How to enable root SSH login in Debian Jessie

Just after clean Debian Jessie Linux installation, you will install SSH Daemon and then you will encounter an issue when you are not able to login via SSH with root account.

$ ssh [email protected]
[email protected]'s password: 
Permission denied, please try again.
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Error "Add-PSSnapin : The Windows PowerShell snap-in 'VeeamPSSnapIn' is not installed" while starting Veeam Powershell Snapin

Sometimes after correct installation of Veeam Powershell Snapin, attempt to load snap-in into Powershell console ends with error: Add-PSSnapin : The Windows PowerShell snap-in 'VeeamPSSnapIn' is not installed.

This problem occures because for some reason Snap-in is not got registered in Powershell. On Veeam official forums they offer many solutions like reinstalling Veeam or reboots-reinstalls of the Powershell module. In my case the following solution was found:

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Scripts for fast address book updating in Lync 2010/2013

As you know, Lync have its own address book (AB) that downloaded by clients. By default, the download and update process of address boook in Lync 2010/2013 triggered in first 60 minutes (random time) after program start. In our company this situation was considered as wrong, thus I had to find solution how to ensure guaranteed updating of Lync address book right after the client starts. Also, there are other issues with delta-updating of address book, like a big delays (5-10 days) after changes in Active Directory are repliacted to Lync AB. 

The consequences of such behavior:

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How-to find duplicates in SQL table on certain fields

Here is SELECT statement to find duplicates in SQL table on certain fields:

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"No Disks have been mounted" error in Veeam while restoring guest files in Windows

While restoring guest files of Windows systems in Veeam (LFR restore), you may get the following error:

No Disks have been mounted. Either disks of this type aren't supported or some error occured. See log file for details.

This error might be connected to the Symantec Backup Exec installed on the same server as Veeam Backup & Replication. Also interesting, that this error occures only for LFR restore, other types of restore are not affected.

There are two possible solutions for this issue.

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How to set up anti-spam in Postfix with DNS BL\RBL lists

Its not a secret, that DNS BL\RBL lists are the most powerful and effective mechanism of anti-spam defense at this time (2015).

How it works?

IP-address of remote host checked against one or more DNS BL lists (free for all by default). If IP-address is in the list - mail session is rejected.

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