Restrict access to Acquia non-prod environment by IP.

.htaccess

# Whitelisted IPs (or regex matching IP ranges).
# If the client IP matches any of the whitelisted
# IPs the "allowed-ip" var is set.
#
SetEnvIf AH_Client_IP 12.34.56.78 allowed-ip
SetEnvIf AH_Client_IP 23.45.67.89 allowed-ip
SetEnvIf AH_Client_IP 34.56.78.90 allowed-ip


# This section should be added near the top of the
# <IfModule mod_rewrite.c> block.
#
# Assumes that all environments except prod should
# be access-restricted.
#
RewriteCond %{ENV:allowed-ip} !=1
RewriteCond %{ENV:AH_SITE_ENVIRONMENT} !=prod
RewriteRule ^ - [F]