This issue has me stumped. I've ordered in a new Dell system (Optiplex 3030 AIO) and I'm having issues PXE booting it, but only on some vlans. If I pxe boot in my work room where I do most of the imaging it pxe boots fine. If I try to pxe boot out on the floor (same site) then it loads the boot.sdi but after this it tries to load the WIM file and it is very slow and it eventually fails. The message is that there is an inaccessible boot device.
The strange thing is if I take another modal desktop or even laptop, it pxe boots fine in those locations.
Something to note is I do have an SSD in the Optpliex 3030, however I have had SSDs in my laptops as well.
I have investigated the smspxe.log file and found that when it starts to load the WIM file I get an error saying "Failed to read PXE settings. The system cannot find the file specified. Error 80070002. This is further followed up with some warnings about certificates not set.
I should also mention that I have played around with the PXE registry setting RamDiskTFTPBlockSize. I have tried all values up to 16384 with no change noticed.
Does this make sense at all?