Windows Update RPC error BatchPatch Forums Home › Forums › BatchPatch Support Forum › Windows Update RPC error This topic has 1 reply, 2 voices, and was last updated 6 years, 8 months ago by doug. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts March 6, 2018 at 9:38 am #8856 ohlssrogParticipant Cant check available updates on our windows 20212 R2 servers, get Windows Update: Error 1601: Failed to retrieve WMI info. The RPC server is unavailable This works fine on our Windows 2008 R2 servers, they have same firewall policy. Is where some new ports that have to be open for 2012 R2 servers? March 6, 2018 at 5:01 pm #10181 dougModerator Windows 2012 R2 does *not* have special/different port requirements as compared to other versions of Windows. Possible causes for ‘RPC server is unavailable’ are outlined here: Troubleshooting Common Errors in BatchPatch Author Posts Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In