windows 7 - Network Share Asking for Password After Some Time

I have two networked Windows 7 Professional computers A and B using workgroup WORKGROUP. Both have identical settings under Advanced sharing settings:

• Network discovery on


• File and Printer sharing on


• Public folder sharing on


• 128-bit file sharing connections


• Password-protected sharing off



• HomeGroup connections allowed

Here's the weird thing.

• Computer A can access all of computer B's shares with no login needed.


• Computer B can access computer A's shares without a login only upon startup; after a minute or so, when trying to access the network shares, they start asking for a password.

I've tried the usual suggestions of security policy but they don't work. I've also tried to remove some unnecessary startup services, but I'm stuck.

Edit: Additional info:

• Both Guest accounts are enabled


• Attempting to override the domain prefix (which is odd since workgroup's are used) and forcing "Guest" with blank password does not work

Any hints?