# CMMVC8024E

The set service assistant IP address task has failed because a required gateway, IPv4 subnet mask, or IPv6 prefix has not been specified.

#### Explanation

When you define the service assistant IP address on a candidate node canister in either IP version format, you must specify the gateway. For IPv4, you must also specify the subnet mask. For IPv6, you must also specify the prefix.
Note: You can change the service IP of a node canister in any state, whether `candidate`, `active` or `service`; however, the initial definition on a candidate node canister has the additional requirements previously stated.

#### User response

Specify all of the required information when you set the service assistant IP address on a candidate node canister. See Resolving a problem topics in the Troubleshooting section of the Information Center.