TFS2012 - Access denied on copying diagnostic activity logs -

TFS2012 - Access denied on copying diagnostic activity logs -

i have problem tfs2012 builds can't seem figure out nor find solution for.

setup:

separate sql server, separate tfs application server (tfsat01 / winsvr08r2) , separate build machine (tfsbld01 / win7x64).

drop share created on tfsat01 - r/w acess granted 2 computers in our domain: tfsat01$ , tfsbld01$ (according #8 http://msdn.microsoft.com/en-us/library/bb778394.aspx)

the build controller configured on tfs app. server tfsat01.

the build agents running on build machine tfsbld01.

problem:

my ci build finish , re-create binaries drop share.

but maintain getting 1 error under other errors , warnings in build output window says: "an error occurred while copying diagnostic activity logs drop location. details: access path '\tfsat01\drops\product-ci\product-ci_20130211.16\logs\activitylog.xml' denied.". activitylog.xml indeed written , can access it.

any ideas why error though seems share configured proper access rights?

note: can around error specifying user-account build agent utilize (also r/w access rights drop share) - rather if stick default networkservice credentials used build controller , agents.

adding in resolution based on give-and-take in comments

the build controller business relationship needs have r/w permissions on drop location. tfsat01$ business relationship provisioned here while build controller configured network service. since these not same business relationship providing r/w permissions nt authority\network service required fix.

tfs2012