Contacting software sites error when I try to update Knime or find an extension

@PMaj welcome to the KNIME forum. Can you give us more context about your system and settings? Especially concerning proxy servers and virus scanners. Sometimes company proxy servers have to be manually activated once a day.

Also:

https://docs.knime.com/latest/analytics_platform_installation_guide/index.html#_adding_local_update_sites