Problem editing ofice documents in Sharepoint 2013 via ssl vpn conections using APM

Hi we are using a edge gateway cluster (using 11.4.1) for ssl vpn´s Full network access connections. We have also a internal f5 clsuter using LTM 11.5.1 from shich we publish the internal sharepoint 2013 sites. The problem is users connecting to the ssl vpn (through the edge gateways, cannot edit office documents, they open only in read only format, wheras editing couments internally works without any problem. I have searched i devcentral and have found a few threads with similar problems, pointing to thta the problem is related to webdav that is used when try to edit the office documents, the solutions have in these cases been using a peristence profile using cookies and or using a irule to catch undocumented http methods.

Now none of these have helped im my case, i have tried both. Teh sharepoint enviroment is a simple publication using no ssl offload, using only http. I would appreciate any ideas as to the cause and suggestions on possibel solutions.

/Regards Craig