After applying FQDN with SSL sharepoint2010 document library's document open as Read Only

Hi,

we have sharepoint server 2010 installed in windows server 2008 R2. We build a document library. After that we installed Office Web Apps. Now,edit in Browser or edit in word/excel etc. all options are working fine.

After that, we configured the site with FQDN (Fully Qualified Doman Name) with SSL. Now, the edit in browser mode is working fine form both server and client machine (for both windows and form based users).

But, When we are trying toedit in word or other office application mode , the files open as Read Only mode (both from server and client machine).

The users cannot save the file.

After trouble shooting a lot, we found many forum says to edit windows registry or do some other operation on client machine. But, in our case it is not possible to edit registry or do some other experiment on every client's machine.

Is their any option to solve the problem from server end, so that each client automatically can open the office files on their own PC and save them to server (instead of re uploading the files to server )?

Please, help us to give the suggestion for solving our problem.

Thanks,