I am working on a system that uses Windows server 2003 fax server that worked fine until the March 10th 2015 patch Tuesday release. Since then, all of our clients are unable to connect to the fax server using the Microsoft Fax and Scan tool in Windows 7, or the older version that comes with Windows XP.
To make the situation weirder, I am able to connect if I am logged onto the client as the domain administrator, but if I take a user and replicate all of 'domain\Administrators' security permissions on both the client and the server, I still receive the same "you do not have security permissions to complete this operation." error message.
I have double checked the security permissions in the Fax MMC snap in by right clicking on 'Fax (Local)' and choosing security, and the shared fax printer on the server. I went as far as adding the 'Everyone' group and gave that user complete access.
I have been told by the client that nothing changed, but take it with a grain of salt.
Multiple reboots have taken place, and all the patches from the latest release have been uninstalled from the server, but none of them seemed to clear the issue up. I have verified that 'NETWORK SERVICE' has the necessary permissions in GPO, both on the client and the server, again to no avail.
Any help would be appreciated.