Since almost two years I have had this problem... today I took another shot doing some more googling. I found this thread:http://www.linuxquestions.org/questi...reply&t=463271
... and believe it or not: there is one post mentioning that "-o sec=ntlmv2" might be important. That's all I needed! Now I can mount the share on my computer. If only the CIFS error messages would have been more helpful!