I’m happy to announce that I’ll be one of the speakers at Zabbix Summit 2022 in Riga. As moderator of the Zabbix Telegram and Zabbix reddit community, I was asked by Zabbix to present at the premier event about Zabbix monitoring.
The 10th Zabbix Summit is taking place in Riga, Latvia on October 7-8. My speech is titled:
As a Managed Services Provider (MSP) we are responsible for dozens of customers, with hundreds of Windows Servers. Therefore, we introduced mechanisms to automatically deploy, configure, and sync Windows Zabbix agents across all these isolated environments. In this process, we leverage a tool set consisting of Azure DevOps, Git, PowerShell, and a publicly available Zabbix agent auto-updater, to provide all our customers’ servers with the latest Zabbix agent configuration possible.
Marco Hofmann is an IT-Systems Engineer with 15+ years worth of experience. He works at the german Managed Services Provider ANAXCO GmbH. His priority is the configuration and maintenance of the company’s central Zabbix environment, which is a key component in the fulfillment of the customers’ maintenance contracts. He also focuses on designing and configuring Citrix RDSH environments, fully automated with PowerShell.
Since 19 December 2020 7pm CET we see a possible worldwide DDOS amplify attack against Citrix Gateway UDP:443 DTLS EDT services.
11.01.2021: Added information about the new Citrix ADC Gateway (formerly NetScaler) firmware releases, which solve the memory leak issue with -helloVerifiyRequest
24.12.2020: Added information about the official Citrix Knowledge Center article CTX289674
Added a final summary, that repeats all possible solutions
Maked it a lot clearer, that -helloVerifiyRequest doesn’t seem to work well
22.12.2020: Added a warning note, that -helloVerifiyRequest doesn’t work on all Citrix ADC (NetScaler) firmware versions
21.12.2020: Added a third possible solution regarding -helloVerifiyRequest
21.12.2020: Initial version
During the night from Saturday (19.12.2020) to Sunday (20.12.2020) our Zabbix Monitoring informed us, that several Citrix Gateway VPX (50) appliances were at its license cap. We investigated the situation and soon found out, that we had 0 ICA sessions on most of them, hence no explanation for the traffic.