I've set up WDS (with some MDT added for good measure) for our company VMs and computers.
Yesterday I applied the 2019-03 cumulative update to the WDS server (running Windows Server 2016 Standard) and today, I can't use WDS any more.
A sample VM will get the initial list of boot images, but regardless of which image I pick, the transfer will stop after a few seconds (with the progress bar having moved a few "squares") and after a minute or so of nothing happening I'll get the generic "A required device isn't connected or can't be accessed" error.
Checking the WDS logs, the only thing that I found is the following:
The Following Client failed TFTP Download:
Client IP: 10.150.4.3
Filename: \Boot\x64\Images\boot.wim
ErrorCode: 13
File Size: 291959795
Client Port: 9956
Server Port: 53793
Variable Window: true
Again, things were working just fine a few days ago and the only thing that's changed that I can think of is the recent cumulative patch that has been applied.
Any ideas what might be wrong?
PS. AFAIK TFTP has error codes from 1 to 9, and I can't find ANY information about error code 13 in relation with TFTP...