Icinga icon   Icinga – Monitor SSL certificate expiration date



A common task among system administrators is the renewal of SSL certificates. It is important to keep track of expiration dates so that it is not too late for us to renew it.

You can simply create an excel or some other type of record of the certificate dates, but you have to remember to check it from time … Read more

EXCHANGE   Exchange – Message queue file mail.que large size



Symptom: Large mail.que file size

Last week my Icinga started alerting about low free space in my Exchange server disk.
After using a software to scan for file sizes I realized there was a too big mail.que file.
Exchange - Message queue file mail.que large size

This is the file in which exchange manages its queues before finally delivering emails. It is usually located in <Exchange_Installation_Path>/TransportRoles/data/Queue

Solution:

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EXCHANGE   Exchange – Cannot remove exchange certificate



Some days ago I tried to cleanup old certificates from my Exchange servers, but I received the following error:

Exchange - Cannot remove exchange certificate

[PS] C:\> Remove-ExchangeCertificate -Thumbprint D09EDD6D5F18C175254AB97046AAAAAAAAAAAAA

Confirm
Are you sure you want to perform this action?
Remove certificate with thumbprint DD09EDD6D5F18C175254AB97046AAAAAAAAAAAAA from the computer's certificate store?
[Y] Yes  [A] Yes to All  [N] No  [L] No to All  [?] Help (default is 
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Home Server icon   Home Server (3) – First steps configuring HP Microserver Gen8



Third post of the Home Server series in which I explain how I built my own server.
Visit the first post for details about the objectives of the project.

Maybe you have decided to have your own server and already you are owner of any model as HP Microserver Gen8. Surely there are many more to be done, but theseRead more

EXCHANGE   Exchange 2013 – Cumulative Update 21 released



In June 2018 Microsoft released Cumulative Update 21 (build 15.00.1395.004) which is the last planned quarterly update for Exchange 2013 (https://blogs.technet.microsoft.com/rmilne/2018/06/19/exchange-2013-cu21-released/)

I was not sure about updating my Exchange 2013 directly from CU12 to CU21. It is supposed to be supported by Microsoft. Maybe I could install an intermediate CU before but, anyway, I decided to move on.Read more

Home Server icon   Home Server (2) – Hardware to buy list



In this second post of the “Home Server” series I show you a list of the hardware I have used. Not all of them are mandatory, but depending on the performance you want to achieve it is interesting to use all of the recommended.

HP Microserver Gen8

The main protagonist of the project. These servers stand out because they offer Read more

Windows   Windows – .NET Framework 4.7.1 install stuck / hangs



I needed to install .NET 4.7.1 to allow updating Exchange 2013 to CU 21.
This is the installer I downloaded and tried to install: https://www.microsoft.com/en-us/download/details.aspx?id=56116

But the installation never ends. It remains stuck without progressing in the “Installation progress” bar. Tested both with offline and online installation:
Windows - .NET Framework 4.7.1 install stuck hangs

To install .NET Framework 4.7.1 download the msu package from the following link:… Read more

F5 BIG-IP icon   F5 BIGIP – Name based reverse proxy (LTM policies)



F5 BIGIP is a very powerful and versatile product that can be used for several purposed. I started using it as a load balancer. Then I used it to replace the previous SSL VPN portal (and it works perfectly).

Some time ago I decided to start using it as reverse proxy (it was time for my old Microsoft TMG to … Read more

Checkpoint   Checkpoint – Database Revision Control



“Database Revision Control” is a really useful feature when you are going to make important and/or many changes in the firewall policy, objects…

To make an analogy, DRC are like snapshots (as in the case of VMWare of a virtual machine) of the policies, objects, etc … everything that contains the database of the management server of Checkpoint is backed … Read more