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The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.
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:
from /var/www/html/app/etc/local.xml file.
You can remove the from the local.xml file with comments:
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