Author Archives: admin

VMDK to VHDX

30 de Agosto de 2018 – 14:34

Follow steps:

  • Download: http://www.microsoft.com/en-us/download/details.aspx?id=42497
  • Open Powershell as administrator and run Import-Module 'C:\Program Files\Microsoft Virtual Machine Converter\MvmcCmdlet.psd1'
  • And after ConvertTo-MvmcVirtualHardDisk -SourceLiteralPath
    d:\scratch\vmx\VM-disk1.vmdk -VhdType DynamicHardDisk -VhdFormat vhdx
    -destination c:\vm-disk1

If you counter following error:

ConvertTo-MvmcVirtualHardDisk : The entry 1 is not a supported disk database entry for the descriptor.

In my case it was entry 4

Follow these steps:

  1. download and extract dsfok tools
  2. use dsfo.exe "c:\temp\disk2.vmdk" 512 1024 descriptor1.txt to extract the descriptor
  3. edit the descriptor file in Notepad++: comment the above mentioned line (as I added the extra single character (#) I also deleted one NULL character from the end to keep the file size of 1024 bytes (not sure if this is needed).
  4. use dsfi.exe "c:\temp\disk2.vmdk" 512 1024 descriptor1.txt to inject the descriptor back into the VMDK
  5. repeat these steps for the other disk (my VM has two .vmdk files)
  6. reissue the ConvertTo-MvmcVirtualHardDisk command

 

Source:

https://gist.github.com/rahilwazir/69a750b70348459875cbf40935af02cb

https://stackoverflow.com/questions/37481737/error-when-converting-vmware-virtual-disk-to-hyperv

Related articles:

http://techgenix.com/vmdk-to-vhd-conversion/

 

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Email Forwarding on an on-prem mailbox to Office 365 mailbox

8 de Agosto de 2018 – 11:30

 

 Configure email forwarding for a mailbox

Set-Mailbox -Identity “OnPrem mailbox” -ForwardingSMTPAddress “Office 365 mailbox”

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SSL Server Test

13 de Julho de 2018 – 11:31

https://www.ssllabs.com/ssltest

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How to prevent internal email spoofing in an Exchange organization

12 de Julho de 2018 – 14:59

Ensuring email security might be one of the most important and most difficult tasks an administrator must face. Every day, servers process thousands of emails and controlling such a big mail flow is not easy. No wonder hackers focus on this channel when they plan attacks. They use various tricks to make users think that opening a suspicious attachment is a good idea.

One of the tricks they use is email spoofing.

Prevent Internal Spoofing in Exchange organization

What is email spoofing?

Email spoofing is a very popular attack method. The sender modifies message headers so that emails appear as sent from someone else. Hackers use it, for example, to impersonate employees of a company to obtain login credentials, personal data, or other confidential information. Two most common ways to protect your organization from external spoofing attacks are:

  • An SPF record – a list of IP addresses which are authorized to send emails from a domain.
  • DKIM check – an email authentication method. It enables you to sign and verify email messages using public and private keys. The public keys, published in the DNS records are used to verify if the message comes from the original sender. You cannot configure it on the Exchange Server natively – you require a plugin for SMTP gateway.

Both ways give good results when fighting with external spoofing. The problem starts when we come across internal spoofing when one employee tries to impersonate a colleague. It might be a joke, or to achieve some benefits – either way, it can sabotage a company in a number of ways:

  • Cause chaos,
  • Induce material damage,
  • Harm data integrity,
  • Damage the company reputation.

 

 

See Full article in https://www.codetwo.com/admins-blog/how-to-prevent-internal-email-spoofing-in-exchange/

 

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IIS: Redirect to another domain

6 de Julho de 2018 – 13:21

Redirect from any page of www.mysite1.com to a static root of another site www.mysite2.com

 

<rule name="site2.com" stopProcessing="true">
             <match url=".*" />
             <conditions>
                 <add input="{HTTP_HOST}" pattern="^(.*)?site1.com" />                 
             </conditions>
             <action type="Redirect" url="http://www.site2.com/{R:0}" />
</rule>
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Nmap Cheat Sheet

3 de Julho de 2018 – 10:04

Nmap has a multitude of options and when you first start playing with this excellent tool it can be a bit daunting. In this cheat sheet you will find a series of practical example commands for running Nmap and getting the most of this powerful tool.

Keep in mind that this cheat sheet merely touches the surface of the available options. The Nmap Documentation portal is your reference for digging deeper into the options available.

read more »

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SSL Redirect URL, rewrite rule

22 de Junho de 2018 – 11:10
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <system.webServer>
	<rewrite>
		<rules>
			<rule name="Redirect to http" enabled="true" patternSyntax="Wildcard" stopProcessing="true">
				<match url="*" negate="false" />
				<conditions logicalGrouping="MatchAny">
					<add input="{HTTPS}" pattern="off" />
				</conditions>
				<action type="Redirect" url="https://{HTTP_HOST}{REQUEST_URI}" redirectType="Found" />
			</rule>
		</rules>
	</rewrite>
  </system.webServer>
</configuration>

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Mysql InnoDB Backup

11 de Junho de 2018 – 19:53

The key to safe database management is making regular backups. Depending on your data volume, number of MySQL servers, and database workload, you can use these backup techniques, alone or in combination: hot backup with MySQL Enterprise Backup; cold backup by copying files while the MySQL server is shut down; logical backup with mysqldump for smaller data volumes or to record the structure of schema objects. Hot and cold backups are physical backups that copy actual data files, which can be used directly by the mysqld server for faster restore.

Using MySQL Enterprise Backup is the recommended method for backing up InnoDB data.

Note

InnoDB does not support databases that are restored using third-party backup tools.

Hot Backups

The mysqlbackup command, part of the MySQL Enterprise Backup component, lets you back up a running MySQL instance, including InnoDB tables, with minimal disruption to operations while producing a consistent snapshot of the database. When mysqlbackup is copying InnoDB tables, reads and writes to InnoDB can continue. MySQL Enterprise Backup can also create compressed backup files, and back up subsets of tables and databases. In conjunction with the MySQL binary log, users can perform point-in-time recovery. MySQL Enterprise Backup is part of the MySQL Enterprise subscription. For more details, see MySQL Enterprise Backup Overview.

Cold Backups

If you can shut down the MySQL server, you can make a physical backup that consists of all files used by InnoDB to manage its tables. Use the following procedure:

  1. Perform a slow shutdown of the MySQL server and make sure that it stops without errors.
  2. Copy all InnoDB data files (ibdata files and .ibd files) into a safe place.
  3. Copy all the .frm files for InnoDB tables to a safe place.
  4. Copy all InnoDB log files (ib_logfile files) to a safe place.
  5. Copy your my.cnf configuration file or files to a safe place.

Logical Backups Using mysqldump

In addition to physical backups, it is recommended that you regularly create logical backups by dumping your tables using mysqldump. A binary file might be corrupted without you noticing it. Dumped tables are stored into text files that are human-readable, so spotting table corruption becomes easier. Also, because the format is simpler, the chance for serious data corruption is smaller. mysqldump also has a --single-transaction option for making a consistent snapshot without locking out other clients. See Section 1.3.1, “Establishing a Backup Policy”.

Replication works with InnoDB tables, so you can use MySQL replication capabilities to keep a copy of your database at database sites requiring high availability. See InnoDB and MySQL Replication.

 

https://dev.mysql.com/doc/mysql-backup-excerpt/5.5/en/innodb-backup.html

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Exporting AD user list

7 de Junho de 2018 – 14:05

> dsquery user -name * -limit 0 >> c:\users.txt

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MRS Proxy Error “The connection to the server could not be completed”

6 de Junho de 2018 – 15:21

Check MRS endpoint user and password.

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