Problem with admin login after deployment

I suspect either the culprit is one of the plugins or the theme you are using.

so, try:

-deactivating ALL plugins temporarily to narrow down the problem. If the problem goes away, activate them individually (one-by-one) to find the problematic plugin.
If you don’t have access to your admin area, try deactivating plugins manually via FTP or phpMyAdmin.
-If that does not help, try switching to the unedited default theme (that came with your version of WP) for a moment by renaming your current theme’s folder in wp-content/themes. The idea is to force WordPress to fall back to the default theme to rule out any theme-specific issue.
If you don’t have access to your admin area, then access your server via FTP or SFTP or whatever file management application your host provides.

-if above steps do not help, this codex guide has more information: http://codex.wordpress.org/Login_Trouble

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