Forum Discussion

robajz's avatar
robajz
Copper Contributor
Oct 23, 2026

Error install Cumulative Update for .NET on Server 24H2 (0x80070bc9)

Hello everyone,   I became the problem first during the .NET updates in 08/2026 and it persists until now.   During the installation of KB5127690 came an error 0x80070bc9. What I have tried: - r...
Hyper-V
windows server
Jamony's avatar
Jamony
MCT
Oct 24, 2026

Your Server 24H2 VM has repeatedly failed .NET servicing despite cache resets, DISM, SFC, and pending-reboot checks. Error 0x80070BC9 means the operation requires a reboot to roll back changes; it does not identify a particular defective update by itself. Microsoft documents a persistent case involving pending servicing and corrupted transactional entries. Compare your CBS log around the failed installation with that documented signature, particularly failures to obtain transaction state. Since you already performed the basic repairs, repeating cache resets is unlikely to provide useful evidence. Record the DISM/SFC outcomes and the relevant CBS sequence, then involve Microsoft support if the signature is unclear. For the documented transactional-corruption scenario, Microsoft recommends an in-place upgrade. Plan that repair only after a verified, application-consistent backup and compatibility review. Do not delete servicing registry entries or pending files based solely on the error code.

  • robajz's avatar
    robajz
    Copper Contributor
    Oct 26, 2026

    Hello Jamony,

    thanks for the reply.

    I downloaded KB5126052 manually from the MS-Catalog, than succesfully installed on the server with requirement to restart.

    After that, during the start of the VM I became "Something didnt go as planned. No need to worry - undoing changes. Please keep your computer on."

    Since then I am becoming an error message 0x80070003.