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Many people will say that this is because the file exists: /var/www/html/maintenance.flag
Our ecommerce development team found that this will occur if you are using APC for PHP optimization, disable APC, and forget to remove:

<cache>
<backend>apc</backend>
<prefix>my_magento_</prefix>
</cache>

from /var/www/html/app/etc/local.xml file.
You can remove the from the local.xml file with comments:

<!—
<cache>
<backend>apc</backend>
<prefix>my_magento_</prefix>
</cache
–>

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