Symptoms:

• holideck.py reports: Web interface should be available on http://localhost:8080, but HTTP requests to port 8080 fail
• lsof -n -i4TCP:8080 shows nothing if holideck.py is not running
• netstat -an | grep 8080 shows nothing if holideck.py is not running

Root Cause:

Cisco AnyConnect Secure Mobile Client is installed, and using launchd to invisibly camp on port 8080.

Verification:

• Run: sudo launchctl list -x com.cisco.anyconnect.vpnagentd
• If you see XML, Cisco AnyConnect Secure Mobile Client is present

Workaround:

• Stop the AnyConnect job with: sudo launchctl stop com.cisco.anyconnect.vpnagentd