CHICAGO (AP) The online insurance marketplaces at the heart of President Barack Obama's health care overhaul are showing signs of trouble handling the volume of consumers on the first day of a six-month open enrollment period.

For nearly every state using the federal exchange, users on Tuesday reached a page with a notification to please wait or a message that said:

The System is down at the moment.

We're working to resolve the issue as soon as possible. Please try again later.

The site for Maryland, which is running its own exchange, displays a message saying We open at 12:00 noon on October 1st.

Callers to the federal call center where consumers can get help by telephone have reported long wait times.

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