The recent OpenSSH software versions no longer support the deprecated SSH protocol version 1 (SSHv1). OpenSSH is used for SSH-VPN, SSH Patrol and console access on ARM600. While the SSHv1 protocol is no longer supported for new connections, the SSHv1 protocol might be in use, especially for SSH-VPN connections in older installations. Arctic devices using the A1 platform, that is, devices with firmware versions A1 5.x.x cannot be upgraded to support the newer, more secure SSH protocol version 2 (SSHv2). Other Arctic devices support SSH protocol version 2 and should be updated if they are still configured to use protocol version 1.