Download file from another server

For 2 years my program has worked with an actionbar button to call a blank app which finds the requested file on the storage server (Windows) and downloads it to the local pc. Suddenly it cannot read the directory on the other server. I realize this is a windows issue. I’ve changed share permissions to everyone. I’ve changed security to everyone. Still will not do it. I don’t know what else to look at. The only workaround I can think of is to have the files write to the local server running the program instead of a shared drive. Does anyone have an idea?

Windows update changed SMB/NTLM defauts not long time ago. Maybe its related to that

Will check. Thanks.