W2K3 server shares not accessible via UNC path from localhost

In an enterprise environment, there are two application servers running different instances of an application.   The application appears to be working but there are some shares on these two servers that some of the support infrastructure depends on.

Call the servers "BoxA" and "BoxB".  Both are W2K3 EE Service Pack 2 (the upgrade to SP2 was relatively recent, 4 - 6 weeks ago, but the this issue did not coincide with the upgrade).

Both servers have a single Broadcom NetXtreme II NIC with a single static IP, and both use the sames DNS and WINS servers.

BoxA has shares on it that can be accessed from any other server in the domain and also locally (e.g. from the console, or a terminal server session).

BoxB has shares on it that can be accessed from any other server in the domain, but CANNOT be accessed locallly, and attempts to access the shares receive the following error message  -

"\\BoxB\b_share_1 is not accessible.  You might not have permission to use this network resource.  Contact the administrator of this server to find out if you have access permissions.  No Network provider accepted the given network path."

It does not matter if the UNC path uses the host name, FQDN, IP addreess, or localhost, all generate the above access denied message when logged onto BoxB with a domain account that has local admin priveldges (or with the local admin account, for that matter).

Very frustrating - any help would be most welcome.

NOTE: This issue seems to have started when troubleshooting a network O/S stability issue - the server was hanging/freezing or getting DRIVER_IRQL_NOT_LESS_OR_EQUAL blue screen STOP 0xD1 errors.   Turns out that this was due to the Service Pack 2 update enabling Windows Scalable Networking Pack features and apparentl bugginess in the Broadcom NetXreme II NIC driver (yes including the latest ones).  To get around this, the W2K3 SNP features were disabled per this Microsoft KB article.   This was done on both of the servers involved  ("BoxA" and "BoxB").  However BoxA has not had any problem with access UNC shares locally.

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This should apply here:
Error message when you try to access a server locally by using its FQDN or its CNAME alias after you install Windows Server 2003 Service Pack 1: "Access denied" or "No network provider accepted the given network path"

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Glen KnightCommented:
This question has been classified as abandoned and is being closed as part of the Cleanup Program. See my comment at the end of the question for more details.
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