Unable to access users home directories from windows 7

I am using Windows 7 Ultimate (Service Pack 1) and experienced the same problem.

My ReadyNAS is a 314 and the problem happened after upgrading from 6.2.4 to 6.4.1.

I first noticed it when my HP printer could not "scan to network folder" (it uses SAMBA ptotocol to save scanned files on the ReadyNAS).  Every time I tried to "scan to network folder" the printer gave the following error: "Access Denied: User name of password is incorrect.  Make sure the credentials are correct in the configuration."  However, these two lines were added to the //readynas/var/log/samba/log.smbd file:
"[2015/12/28 19:02:05.093785, 2] ../source3/auth/auth.c:305(auth_check_ntlm_password)
check_ntlm_password: authentication for user [ken] -> [ken] -> [ken] succeeded"

indicating that the ReadyNAS felt the authentication worked.  It WAS working just fine before the ugprade.

Access from Windows 7 Ultimate was fine after the ReadyNAS upgarde UNTIL I rebooted my Windows box, then it, too, would not connect to the "ken" home folder on the ReadyNAS (although "non-home" folders with anonymous access could be connected to just fine).

I tried the "net use" commands described ealier in this thread and received "System error 86 has occurred.  The specified network password is not correct." just as did the OP.  The log.smbd file on the ReadyNAS, however, claimed success (as it did when I tried to attach from my printer).  I then tried "net use" with a bogus password and received "System error 5 has occurred.  Access is denied." which makes sense.  The log.smbd file indicated, "FAILED with error NT_STATUS_WRONG_PASSWORD" as would be expected.  I tried changing the password for the "ken" user and tried "net use" with the new password and had the same results as with the orignial password.

Finally, I changed the account name from "ken" to "ken1" and back to "ken" (since the OP suggested this as the fix) and now the "net use" command returns "The command completed successfully" and now both the printer and Windows can attach properly to the "ken" home directory.

It sure seems that the ReadyNAS Samba daemon was passing something incorrect back to the attaching OS indicating bad credentials despite credentials being proper (and the ReadyNAS thinking they were proper, based on log.smbd).  Somehow, renaming the account associated with the home folder on the ReadNAS fixes this.

StephenB - it appears that level 3 support has looked at this, but there isn't any indication that a bug report has been logged.  Can you run this up the flagpole so it gets fixed for other users?  I'd also like to know just what the bug was, and what was causing it, once it is tracked down.