Unable to edit sharepoint 2013 documents in the browser and application

Question

I am unable to edit the sharepoint 2013 documents in the browser or the application. This is occurring in all the sites under the farm.

Browser: It opens perfectly but is non editable

Application: It opens in Read-only mode. Asks me to save a local copy to edit and it saves locally.

I have tried the following solutions and still it doesn't work:

• Changed excel setting

• I do not have KB3055034 update

• Deactivated "Open Documents in Client Applications by Default" to open documents in the Web App to edit documents in the browser by default

Thanks for your help in advance!