CIFS permissions issue with fstab but not mount command

[ianmanning]

I want to mount a Windows share using CIFS on my Ubuntu 17.04 machine. If I use the mount command below it works fine, and I can access the Windows share:

sudo mount -t cifs //servername/sharename /home/myuser/mediafolder -o credentials=/home/myuser/.smbcredentials,dir_mode=0777,file_mode=0777

If I attempt to make this permanent using the following entry in /etc/fstab I get a permissions error when I try to access the mount point at /home/myuser/mediafolder :

//servername/sharename /home/myuser/mediafolder cifs credentials=/home/myuser/.smbcredentials,gid=1000,uid=1000,iocharset=utf8,file_mode=0777,dir_mode=0 0 0

What is the difference between the two options above, and why am I denied permissions with the 2nd approach?

[deadflowr]

You might need to add the _netdev option to the fstab.
_netdev delays mounting of the file system until after networking connection has been established.
And yes, that's how it's suppose to be spelled with the underscore: _netdev

[ianmanning]

You might need to add the _netdev option to the fstab.
_netdev delays mounting of the file system until after networking connection has been established.
And yes, that's how it's suppose to be spelled with the underscore: _netdev

Thanks for the suggestion. I just gave it a shot but still have the "Permission denied" error.

[deadflowr]

Is the dir_mode=0 right?

[ianmanning]

Is the dir_mode=0 right?

Yes