To authorize DMS to access RDS instances, you need to add the CIDR blocks of DMS to the whitelists of RDS instances. This section describes how to whitelist DMS servers.
DMS allows you to add the CIDR blocks of DMS to the whitelists of specified RDS instances with one click.
Set for All Instances: Add the CIDR blocks of DMS to the whitelists of all RDS instances under the current Alibaba Cloud account.
Set for Current Instance: Add the CIDR blocks of DMS to the whitelist of the current RDS instance.
Note:
It takes one to five minutes for new settings to take effect. Wait a few minutes and try to log on to RDS instances again.