Problem with file sharing - Lion to Mountain Lion

I have two MBP's. One is running Lion (2011 vintage), the other is running Mountain Lion (2012 vintage). They are connected on my home network as follows:
MBP with Lion --> Ethernet cable --> D-Link Router --> Airport Extreme
MBP with Mountain Lion --> via WiFi to the Airport Extreme (five bars of signal strength)
I turned on file sharing in the MBP/Lion machine and made a couple of folders shared. Then I went to the MBP/Mountain Lion machine and saw the MBP/Lion machine in the sidebar of a finder window, under the shared devices section. I clicked on that icon, and the MBP/Mountain Lion tried to connect for a minute or two then told me it couldn't. I tried this two more times and it failed both times.
Then I tried connecting using the "Connect to Server..." command in the finder. I entered the afp address of the MBP/Lion machine, and the MBP/Mountain Lion machine still failed to connect.
If anybody can help resolve this so that I can access the shared folders, I would appreciate it very much. Thanks in advance for any suggestions.

Did you try to use Guest account. Make sure it is ON on the Lion machine and permissions are set properly. Then try to connect again from ML.
If that works you have usthentication / permissons issues with the account you are using.
If it does not work let us know and we will take it from that point.
Guest ON is only for testing. I would not leave guest account on unless you know the risk and are OK with that.
TZ

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