We have a SharePoint 2013 farm that most of the site collections are in 2010 mode. These sites can be accessed internally and externally through an F5 device. As we start to move the sites to 2013 mode we noticed that we cannot open the ribbon externally.
It woks find internally. It get stuck on "working on it". It will stay like that for hours. Also the context menu for editing files does not open.
The ULS logs show that access to site is taking place but do no show any errors. Any thoughts you have on the matter are welcome and thank you in advance.