As part of our ongoing efforts to ensure that both the Acquia platform and your websites remain reliable and secure, Acquia is restricting sshd_configs to allow only secure Key Exchange Algorithms (KexAlgorithms) in the Acquia Cloud 1.90 release.

Starting with version 1.90, all Acquia Cloud users that use SSH to connect to their site environments must have SSH keys with 2048-bit encryption or greater.

Versions of Acquia Cloud that were released prior to version 1.90 (including the 1.89 version) allow users to use SSH keys with less than 2048-bit encryption.

You may want to review a website with a custom domain name before the domain is publicly mapped to the website. For example, a domain name will often be routed to a live site while development is ongoing on a separate server.