I have deployed an Umbraco 7 (with MVC) site into production. In production there are two issues I m facing which were not there before.

In back office I m not able to upload media files which is a out of box feature. Log4net logger is not logging errors which is again an out of box feature. Locally and in test environment everything was good. I don't have a custom code to share, please help and guide me what can be reason for this ? How I can fix it ?

Thanks