1) you might hit following defect. please check this.  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvn516252) also check following connections through ESA's CLI:  telnet update-manifests.sco.cisco.com 443  telnet downloads.ironport.com 80  telnet...

oh. I see this is Cloud-based Host. seems you don't have permission for 'Alerts' tab. However, you should receive alert notifications via email.can you please share URL of SMA ?If you can confirm that messages quarantined are normal in terms of size ...

yes. you can check by clicking on 'View Top Alerts' button in 'Administration -> Alerts' page.by message numbers and sizes, it means each message in average is ~2 MB.all in all, the rate, size of quarantined messages needs to be checked and verified ...

well, you can check for number of messages and sizes on Quarantine folders page. if you see abnormal data, such as '-' numbers on messages, huge size numbers - it could be symptom.2nd way is - check alerts on SMA via 'displayalerts' CLI command.have ...