Raspberry icon   Raspberry – Raspbian installation and initial setup



Some time ago I started reading documentation about Raspberry. Nothing related to my job but, as a hobby/challenge, I decided to buy one and start a project in future posts I will talk about…

Also owner of a Raspberry? Follow this minitutorial to perform the basic installation of Raspbian OS with remote access enabled via SSH using WiFi connection.… Read more

EXCHANGE   Exchange – SMTP error: 550 5.7.1 Client does not have permissions to send as this sender



Problem

Last week I was testing the IMAP/SMTP connection of my Exchange 2013. Unexpectedly Outlook returned the following error:
Exchange - SMTP error 550 5.7.1 Client does not have permissions to send as this sender

The message does not appear completely but seems to be “550 5.7.1 Client does not have permissions to send as this sender”. Obviously the user does have the permissions (the user was the owner of the mailbox itself).

Resolution

Thanks … Read more

Windows   Windows – Renew certificate assigning the same private key



When renewing a certificate it is not necessary to generate a new csr. This is possible by maintaining the same private key.

When received the renewed certificate from the 3rd party certification authority, we can try to import it and assign the private key from the management console (mmc -> certificates).
One of the options that are shown when … Read more

Windows   Windows – Add secondary IP addresses to interface



Sometimes it is neccesary to configure a network interface to listen on more than one IP (for example, web servers containing multiple SSL certificates…)
Add secondary IP addresses to interface

After adding the new secondary IPs, If not explicitly avoided, outgoing traffic can be generated also by these instead of only by the primary. These can lead to connection errors (for example firewall receiving unexpected Read more

Sysadmin tools   Sysadmin – Best system administrator tools: MRemoteNG



Given that my work involves managing a wide variety of systems, a good remote connection manager is very important to save time.

I have to connect via SSH, RDP, web, telnet… and MremoteNG is what i was looking for.

From the MRemoteNG website:

mRemoteNG is a fork of mRemote: an open source, tabbed, multi-protocol, remote connections manager. mRemoteNG adds … Read more

Checkpoint   Checkpoint – Incrementing virtual system instances to solve cpu overload



Due to some network infrastructure changes, the traffic passing through my internal FW (a Checkpoint VSX virtual system) started to suffer latency and packet loss.

No change had been made to the Checkpoint VSX, but for any reason, since that network changes, Checkpoint was not processing the traffic succesfully.

Performing a top on the VSX appliance containing the active “iNTERNAL … Read more

Lync   Lync – Error 1603 uninstalling Lync 2013



Some time ago, I started a Lync 2010 to Lync 2013 migration process but, due to non-technical reasons, I could not finish it. No users were migrated.

Now I want to migrate from Lync 2010 to Skype for Business Server 2015. A triple mixed environment (Lync 2010 + Lync 2013 + Skype for Business Server 2015 ) is not supported, … Read more

Lync   Lync – Configure holiday lists for Response Groups



When using response groups, business days and hours can be configured. This way a different action (than attending the call) can be configured when in out of business hours (disconnect the call, forward to another response group or contact…)

Lync Response Group business hours

Those actions should be also configured on special days or data ranges that the business is closed. For example, public holidays. … Read more

Windows   Windows – Cannot cannot shrink a volume beyond the point where any unmovable files are located



I finally received my new Dell Inspiron 15 Serie 5000 with a 1TB hard disk!

Target

I would like (maybe very shortly) to move the system and applications to a new SSD drive (perhaps 120GB or 240GB size). So, given that the C: (system) partition has only 30 GB used (~896 GB of total size), one of the first configurations … Read more