can not access wp-admin after migrating to openshift

I recently migrated to Redhat’s Openshift PaaS.
My site is little bit slow in loading but working fine but Now I am unable to access wp-admin.

mysite/wp-admin is redirecting to mysite/wp-admin/upgrade.php?_wp_http_referer=%2Fwp-admin%2F which says “webpage is not available.

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What may be the possible reason behind it and how to resolve the problem?

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