Everytime I try to publish the new version of FlashPlayer Plugins in SCUP I get an error. SCUP.log:
PublishItem: InvalidException occurred during publishing: Failed to sign package; error was: 2148081673 Updates Publisher 14.03.2016 07:32:53 21 (0x0015)
Publish: A fatal error occurred during publishing :Signature verification exception during publish, verify the WSUS certificates and advanced timestamp setting are properly configured. Updates Publisher 14.03.2016 07:32:53 21 (0x0015)
I checked settings in SCUP and there is no firewall issue. Certifactes are ok and in place
I just searched on google with the error you are facing and found one mircosoft post where the similar issue seems to be resolved. https://social.technet.microsoft.com/Forums/systemcenter/en-US/3ef73226-f9bf-4efd-a7d8-4d5 85760df89/publishing-scup-2011-updates-to-wsussccm-are-failing?forum=configmgrgeneral
Can you please try this out ?