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Every colo I've visited has a system for allowing physical access for our equipment, generally during specific operating hours with secure access card.

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While this is true, you stated a tautology: of course every colo you visited allows visiting.

They could have visited in an official function such as inspector while customers didn't have direct physical access to the facility.

secure access cards, IDing, bag check, and a tech following you around. Of course cabinets are all locked up as well.

A lot of these places are like fortresses

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