Windows 7: Windows 7 cannot access all shares

Our company has a mixture of Windows XP sp3 and Windows 7 (professional and enterprise) PC's and and a mixture of Server 2003 (R1 and R2) and Server 2008 (standard and Enterprise).

The main file server is Server 2003 R2 sp2 and has 17 shares on it.
The Domain Controller is also Server 2003 R2 sp2

Our corporate structure has about 14 more domain controllers scattered across North America, and I must assume they are all Server 2003 R2 sp2 (they are very strict at keeping them all the same level)

While some users have issues mapping a Drive on all workstations, I think this is AD related as that drive is mapped via their profile in AD, and not through a logon script.

The problem is with 1 of the shares mapped via script.

by typing \\servername\ into an explorer menu, you can see all 17 shares. You can access all shares (as allowed by AD-groups security) except 1. This 1 happens to be the main file storage location for our company and has unrestricted access to everyone (including guests).

Only some of the Windows 7 computers have this issue, and one of the users is and admin with access to everything but group policy.

For the admin a reboot fixes this issue, but it eventually comes back. For the other user (belongs to company-users in AD, as does everyone), sometimes a reboot will fix the issue, sometimes not.



If they try to gain access by typing the full UNC path (e.g. \\servername\departments) a windows error pops up stating the drive is unaccessible. However; if the user types \\servername.domainname.local\departments then the drive is accessible.

If the receive a link in their e-mail that does not contain the .domainname.local attached, then the destination is unreachable, including link in excel work books.

I have check all settings, and followed all of microsofts directions to resolve this issue, but nothing helps.

I have found some postings stating a co-relation with symantec endpoint, and we do have this, currently at version 12.1.671.4971 which we just upgraded from 11.0.6

As we are rotating our fleet of PC's, we are getting more and more Windows 7 PC's and need this resolved if we can.