Same issue here.  Really pissing off the users.  We have Disable Captive Portal Detection "enabled" and still have the issue.  It still pops up when in the office behind the MX.  Does seem to happen when network connectivity changes occur.  AC event logs indicate it's still trying to contact the portal.  ... View more

This is still an issue?? In rare circumstances the intrusion detection and prevention process may crash and restart. In some circumstances this can cause a minor disruption to network traffic. This issue is expected to be resolved through an update to the IDS/IPS container rather than the MX firmware version.   ... View more