APC ATS (Automatic Transfer Switch) AP4421 Data Centre Expert Shows “Transfer DDF Failed”

Using Data Centre/Center Expert and adding an APC ATS switch, even though the configuration was correct, FTP was enabled and the relevant settings set for SNMP for the relevant IP addresses the following error is observed in the Data Centre Expert “Device status may be inaccurate due to attempt to transfer DDF failed”. After much […]

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Changing Port Speeds on a 5520-VIM-4YE VIM Module in 5520 Universal Hardware Switch

The 5520-VIM-4YE, this has 4 x SFP28 ports 10/25. You can use 10Gbit or 25Gbit speeds on these ports. On an Extreme 5520 Universal hardware switch this will be ports 57-60 (on 48port model) or 33-36 (on a 24 port model) If you want to use 4 x SFP+ modules running at 10Gbit, you need […]

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MTA-STS (Mail Transfer Agent Strict Transport Security)

Emails crossing the internet use secure connections encrypted using Transport Layer Security (TLS). However, there remain vulnerabilities in this method of protecting the confidentiality of emails, whereby a person-in-the-middle can trick incoming connections to send to another server and/or send information in the clear. MTA-STS is a standard designed to address these vulnerabilities and is […]

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