gcba failure without having it installed

Hello, we have genesys integrated with salesforce, we have verified that the users do not have the GCBA installed nor do they have permissions, etc., but when a new tab is opened in salesforce it appears blank and the error we get is for gcba, get 127.0.0.1 :8191/gcbaId err_connection_refused, but no user has gcba installed on their PCs or anything like that, can you help me?