Github user DaanHoogland commented on the pull request: https://github.com/apache/cloudstack/pull/1297#issuecomment-168254041 done some testing:   with cloudmonkey: ``` ðµ > update virtualmachine id=39f058ad-3021-4753-9c96-1aa922a74632 securitygroupnames=exceptional Error 431: Virtual machine must be stopped prior to update security groups ðµ > stop virtualmachine id=39f058ad-3021-4753-9c96-1aa922a74632 ... ðµ > update virtualmachine id=39f058ad-3021-4753-9c96-1aa922a74632 securitygroupnames=exceptional ... ``` resulting in 
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