Other transport protocols than HTTP or HTTPS
As of SDL Web 8, protocols other than HTTP or HTTPS (both those included in the product or custom ones you developed yourself) are deprecated.
You can continue using this functionality, but note that the Role called "'Content Deployer (other protocols)" has now become a part of the new Role called Content Deployer, which is a microservice that encompasses all protocols.
To use non-HTTP(S) transport protocols, ensure that in all your Content Deployer configuration files (cd_deployer_conf.xml) the root Deployer element has an attribute called LegacyTransport, set to true.
Deprecated transport protocols cannot be used in combination with a Redis database.