Entries by Andrej OSmicro

Mac OS X Remove SSH Known Host

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If you are getting this error while trying to SSH into a machine using the same name or the same IP address that was already used for SSH, you will get an error bellow: @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Someone could […]

How to test SMTP operations using Telnet

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1. Telnet into Exchange server hosting IMS service using TCP port 25. Command is telnet <servername> 25 2. Turn on local echo on your telnet client so that you can see what you are typing. On Win 9x and NT 3.5/4.0 Telnet client this done by selecting the “preferences” from the “terminal” pull down menu, […]

MaxRequestLen : Linux File size upload error

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With new version of Linux distros I have noticed a lot of default configurations are set with really low values. One of them is MaXRequestLen in Fast CGI. It used to be set to 1Gb by default, with new distro installs its value is 128kb (Ubuntu, CentOS, RedHat, Fedora etc.). In order to upload files […]

How to change recursion limit (file limit list) in pure-ftpd

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How to change recursion limit (file limit list) in pure-ftpd By default, pure-ftp server has a limit on a number of files displayed through an ftp client. It is usualy 2000 or 7500, if you need more files displayed follow this quick tutorial. Solution :- Just login to your Server with root user and do […]

How to Manually Configure Outlook (Office 365)

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After several attempts of trying to configure Outlook using the wizard – I decided to configure Outlook manually. I ran into a few speed bumps as the configuration for Office 365 is slightly different than an On-premise configuration:   Manually configure Outlook   To manually configure Outlook to connect to Exchange Online, follow these steps: 1. Determine the mailbox […]

MySQL Table is marked as crashed and last (automatic?) repair failed

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If you have a table in mysql that has crashed and your attempts to repair it using mysqlcheck have failed, then you may have to resort to the lower level myisamchk command. To use this, you will need to stop the server process (usually service mysqld stop or /etc/init.d/mysqld stop) and then find the data […]

Hyper-V Virtual Machine Very Slow Network – VMQ – Broadcom

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So couple of days ago I was setting up our new Dell Server running Server 2008 R2 operating system and a Hyper-V role. After the initial setup was done and Hyper-v role configured it was time to install it’s first VM running Server 2008 R2 as well. Installation went through properly, added all required modules, […]

How to make Windows 7 Slow Network Faster

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1) Disable Autotuning Disabling autotuning will help much on DNS lookup and network discovery. It improves the data transfer speed also over the network. Start command prompt as administrator, and follow the commands as shown in below example. 2) Remove RDC ( Remote Differential Compression) This feature introduced with Windows Vista to transfer data over network […]

Step-By-Step Windows Server 2008 Domain Controller

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In this tutorial I am going to explain how to install and setup Windows Server 2008 Domain Controller and DNS server which can be used as centralized server to keep user information, OU, setting up group policies etc. 1) Go to Start >> Run and type “dcpromo” and press enter. Server will now start checking […]

How to Set the NUM LOCK State at Logon in Windows

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Set the NUM LOCK state to be ON by default at logon. You can accomplish this by using a script file that runs either at startup or, in Windows, through a Group Policy. TESTED ON WINDOWS XP PROFESSIONAL Start Notepad. Copy the following code, and then paste the code into the text file: set WshShell […]