Symptoms :
When user try to login using Lotus Notes shown error : “Insufficient Memory – Group Cache Pool is full”. Even though you re-certify user cert id and try to delete this user and re-create again. The error still shown when login to Lotus Domino using Lotus Notes.
Cause :
This is because your Lotus Domino group has reach over maximum 5000 groups
Solution :
Please delete unused Lotus Domino group