Sysadmin tools   Sysadmin – Best wiki software / documentation tool



Some time ago I was researching to find a good tool to create and manage IT documentation at work. These are the features that were essential for me:

  • Editor Wysiwyg (not directly in markup language)
  • Paste images directly (instead of first uploading it to insert it in the document).
  • Team work: Full role and permission system. In case with LDAP
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Home Server icon   Home Server (7) – Install Linux Debian virtual machine in ESX



In this 7th post of the Home Server series, after having configured a SSD drive, a working ESX environment and the RAID disks, let’s create our first virtual machine based on Debian Linux.

For the goal we want to achieve (hosting a web server, our personal files, personal streaming server, …) we do not even need the graphic … Read more

   Exchange – Update to fix escalation privilege vulnerability



Due to the vulnerability that allows privilege escalation I wrote about in this post, Microsoft has released a cumulative update for all supported versions of Exchange Server (Exchange 2010, 2013, 2016 and 2019).

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EXCHANGE   Exchange – New vulnerability that allows privilege escalation



A new vulnerability that affects Exchange on-premise servers has been discovered recently (https://dirkjanm.io/abusing-exchange-one-api-call-away-from-domain-admin/). By making use of the high privileges Exchange servers have by default, the attacker would be able to escalate from any user with a mailbox to Domain Admin access.

According to Dirk-jan Mollema (see upper link), the vulnerability has been tested against …

  • Exchange 2013
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Checkpoint   Checkpoint – VSX Virtual Memory full – Enable 64 bit



Symptoms

I manage a 2 node VSX clusterXL environment that hosts 3 firewalls (virtual systems).
Some days ago I came across a problem in which one of them started  (or maybe more time ago but not aware) to experience bad performance, outages, timeouts…

Trying to make a failover and move the VS to the other node fixed the problem until … Read more

Home Server icon   Home Server (4) – Install SSD to HP Microserver Gen8



Although it is not essential I strongly encourage you to install an SSD disk to your HP Microserver Gen8 to host the system you want to run. I will use it for a VMWare ESX and the virtual machines that will create in it. As I said in the previous post, since the prices are more than affordable, the price/performance … Read more

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