emc vnx 5200 authtenication errors with user a

"Hi everyone, I have an EMC² VNX 5200 storage system, and while checking the logs under System > Monitoring and Alerts > SP Event Logs > Show SP A Event Logs, I noticed the following error.

Client is not allowed to login trial because login failure time exceeded the limits from client 128.221.252.101with username a 

This is happening every minute. I haven't been able to find where the error is coming from; 'user a' doesn't exist anywhere. Does anyone know how to trace where this might be misconfigured so I can fix it?"