After logging into vCenter (6.7 U2) I noticed several vMotions stuck at 7%. I also found several errors in tasks – “A general system error occurred: Operation timed out”. When I tried to vMotion a VM manually I got and error. vCenter failed to validate the target. After some investigation in different log files I decided to restart vCenter. After vCenter restart all the stuck vMotions were gone and everything was working again.