Learn Italian: Senza la rete, non si è mai connessi. - Without the network, one is never connected.

This is a special rule for the impersonal si. When you use si with the verb essere (to be) followed by an adjective, that adjective must always be in the masculine plural form. So, even though 'one' feels singular in English, Italian requires si è connessi instead of si è connesso.

Why are non and mai separated by si è?

In Italian, the double negative structure non ... mai (never) wraps around the verb and its pronouns. The pronoun si has to stay directly attached to the verb è, creating the block si è. Therefore, non goes before the block and mai comes right after it.

Does rete mean the internet here, or just any network?

The word rete literally means 'net' or 'network'. While it can mean a physical net (like a fishing net) or a television network, in modern contexts like this sentence, la rete is commonly used as a direct translation for 'the internet' or 'the web'.

Could I say non sei mai connesso to mean the general 'you' instead of 'one'?