Problem with my Mac running mountain lion not connecting to server

Hi there,

I have a problem connecting to the HDD shared on my local network. As far as I understand this might be a Mountain Lion (10.8.4) problem, because all my other devices can connect to it (even my iphone throught an app called FileExplorer).

I read that it might be related to a Samba problem, but I tried to install SMBUp and I still cannot connect to my HDD. Whenever I try to connect to it via the Cmd+K it says "The version of this server is not supported". Please help me this is blowing my mind. Also, it's a shame that everything but my main machine can connect to my HDD (PCs, Android, iOS are all fine).

Thanks in advance.