I also have the same problem after running
bitbake linux-imx firmware-bcmdhd packagegroup-base packagegroup-fsl-tools-testapps
The first time I have 2 fetch failures:
imx-vpu-1_5.4.35_r0 and imx-lib-1_5.5-r0

But the 2nd time( 2 days later) only 1 failure:
imx-lib-1_5.5-r0

Would you please check your server a.s.a.p. and give me feedback when I can fetch such files without
any problem ?
BR
Xi