E: Oops didn't see your previous reply.
Hi, if you're using windows server 2012 R2
I've got a similar issue with my shared folder.
It was because of the feature SMBv1 (used by majority of Linux) not deployed on my server.
Be sure you installed this feature on your server :
After that i was able to mount my shared folder without any problem.
Let me know if it worked for you.