Domain mapping. I can't access settings

When I try to access domain mapping settings in network I get 404 page error.
I try to disable all plugin - no results.
Sunrise define is correct in wp-config.
Sunrise.php is in the wp-content folder.
No server cache, no cache plugin.

I fix htaccess rules to correct one (rules for multisite) - no results.
There is error_log on server wich have over 500MB.