POWERSHELL   Powershell – Could not create SSL/TLS secure channel



I use Powershell to send monitoring results to the Icinga API (passive checks). For example, to check if the Exchange backups were processed correctly, I run a Exchange powershell and then the results are sent using “Invoke-WebRequest” command.

Since I disabled obsolete and insecure TLSv1 and TLSv1.1 protocols in the Exchange server, the script was not working anymore returning error:… Read more

   Exchange – Bulk import of distribution group members from csv



A short but useful post:

Suppose you need to import hundreds of members to a distribution group.
The list is in a CSV file:

Name,Email
user1,user1@domain1.com
user2,user2@domain2.com
user3,user3@domain3.com
user4,user4@domain4.com
user5,user5@domain5.com
user6,user6@domain6.com
user7,user7@domain7.com
user8,user8@domain8.com
user9,user9@domain9.com
user10,user10@domain10.com
user11,user11@domain11.com
user12,user12@domain12.com
user13,user13@domain13.com
user14,user14@domain14.com
user15,user15@domain15.com
user16,user16@domain16.com
user17,user17@domain17.com
user18,user18@domain18.com
...

To bulk import all the users, a simple command like this is enough:… Read more

Security   Security – List available cipher suite using nmap



If you are in process of securing your web server or site, there are some tools and online resources that can help us a lot (in one of the following posts will show you some of them).

But simply using the command the fantastic nmap tool, another interesting feature is listing the available cipher suite certain site offers using the … Read more

Linux   Linux – TCP listener daemon with tcpserver



To configure passive checks in Nagios/icinga I use a tcp listener daemon that launches a script (See Nagios – Using passive checks without agent)
Tried to use inetd superserver daemon, but in the last versions, i have not been able to make it work correctly (See last update in my post: Linux – cannot found / missing inetd.conf)Read more

F5 BIG-IP icon   F5 BIG-IP – Rollback tmsh commands



Today a very short and simple post to learn how to rollback configurations performed via tmsh.
After executing some commands, if finally we need to undo those changes we can get it, at least, by the following ways:

    • In case of HA environment, the standby node configuration can be sync so that we set the active (changed) node to
Read more

IRONPORT icon   Ironport – Automate commands / scripts from Windows



In another post we saw the way to configure a SSH connection to Linux without password via public/private key. To allow SSH connection without interaction (without password) to Cisco Ironport ESA (Email Security Appliance) from a Windows machine is a bit different. These are the different steps:

Generate public/private keys

To generate the keys, we will use Puttygen (PuTTY Key Read more

Linux   Linux – Bash scripting useful commands and tips



Some examples of very simple commands and features that become very powerful when used together. In future posts we'll see real examples of bash scripts used to create custom nagios checks/plugins.

Concatenate files – cat

# cat FILE1
this is the file1

# cat FILE2
this is the file2

# cat FILE1 FILE2
this is the file1
this is the 
Read more