Sharepoint quick edit issue when using Forefront UAG

I have posted this thread in sharepoint forum and it was said to post here

In SharePoint we have the options for quick edit for list items where we can edit multiple columns at once.

Normally when user is in corporate network he can quick edit items and update all of them from excel but when he uses UAG then he can't update more than 15-20 items depending upon the number of columns. I though this is post size issue which is set to around 49152 bytes.I doubled it but still item update remains same.

Do I need to do any other changes after updating the size.

Thanks