drupal rebuild content access HTTP error 503 occurred

I have a multisite drupal installation with domain access module. Off late, I have started getting this warning 'need to build access permission'. Also, I went tried rebuild the access permission, I get 'An HTTP error 503 occurred. /batch?id=24&op=do'

The solutions suggest that I disable the modules and rebuild the content access permissions.

the sites seem to have suddenly gone beserk. I get access denied for for unauthenticated开发者_Go百科 users.

I have live sites. Is there an alternative solution to it?

Thanks in advance :)

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Seems you are using malconfigured content access modules, probably the domain access module you mention, and possibly others: Taxonomy Access Control (or TAC Lite), Access Control, Nodeaccess - stuff like that. Their permissions might be clashing with each other and with Drupal's core Permissions module. Revise them and, if necessary, uninstall the modules and try reinstalling+reconfiguring them. And yes, definitely rebuild access permissions afterwards.

Also, make sure your server isn't overloaded or something. The 503 errors, plus the previous issue you posted, possibly involving script execution timeouts, might indicate your server can't handle your Drupal install. Remember that Drupal is highly db-intensive and it's generally not the best idea to use a multisite Drupal install for high traffic sites.

Can't think of anything else, sorry...