we use CudaLaunch (latest version 2.5.2) for accessing our file share via internet. Before, the share was located on a Windows Server 2008 and it worked fine. Now I migrated the file server to a Synology NAS, the access rights are OK, doublechecked this. Access is given from Windows domain user's credentials.
On our NG400, I configure the network places, just changing File Server Host (IP), File Server Path is unchanged. I can log in without any problems, but afterwards, choosing Folder and klicking on the share, I get "Invalid credentials". Give it another try and use Synology's admin credentials, it just works. No way to access the share with domain user credentials.
I also tried to configure a new network place, no success. SMB3 is activated at the Synology.