Symptoms
The GTM/DNS HTTPS monitor may fail to find the configured receive string in a HTTP response, causing the monitored service to be incorrectly marked down.
Impact
A service is incorrectly marked down. This can cause the BIG-IP GTM/DNS to return a suboptimal answer or no answer at all to DNS queries.
Conditions
This issue occurs when all of the following conditions are true:
-- The server being monitored performs an unclean shutdown of the SSL session (the underlying TCP connection is closed without first issuing a close notify alert at the SSL level).
-- The server's HTTP response does not terminate with a newline.
Workaround
This issue can be worked around by performing any one of the following actions:
-- Ensure the server issues a close notify alert before it closes the underlying TCP connection.
-- Ensure the server's HTTP response ends with a newline.
Fix Information
The GTM/DNS HTTPS monitor no longer fails when the SSL peer performs an unclean shutdown.
