Please help. I inherited sharepoint without knowing anything about it and it crashed hard a few weeks ago but we were able to restore most functionality and this is the only thing that is left. When I open any documents with WopiFrame I get the warnings that the stuff is insecure or coming from untrusted source. The SSL cert is valid is installed. I applied it in bindings. I also added it to trust relationship in Central Administration. I also changed it in OfficeWebAppsFarm using PowersShell to point to correct one and rebooted all the servers as suggested and nothing works. Any suggestions would be greatly appreciated. I am sure I am missing just one minor thing that I am not aware of.