Core issue
This issue occurs due to the presence of Cisco bug CSCsd59064.
The Cisco Adaptive Security Appliance (ASA) temporarily blocks all traffic as soon as the http server enable command is issued. After a few minutes, there are intermittent drops. Then, things return to normal.
This problem occurs when the http server enable command is issued with multiple hosts configured on the same interface.
Resolution
In order to resolve this problem,
Iissue the http server enable command before the addition of any HTTP hosts. Alternatively, only configure one HTTP host per interface.
This issue is fixed in later ASA software releases.
Use Software Download for downloading the ASA software.
