McAfee firewall blocking READYSHARE access on RAX80

Does anyone know what I have to do to get McAfee firewall software to stop blocking my READYSHARE drives?  I can turn off the firewall in McAfee and access the READYSHARE drives instantly.  I can then turn McAfee firewall back on and I can access my READYSHARE drives, but only for an undefined amount of time.  If I haven't accessed the READYSHARE drives for several days, when I go back to Windows Explorer and click on one of the drives, I can no longer access them.  I then must go back to McAfee, turn the firewall off, access the drives, then turn the firewall back on.  I can then use the drives freely again, for some finite period of time anyway...

Anyone know what's going on?

Thanks.