HI Venkat, Which hypervisor you are using and also check the agent log in case of KVM.
For xenserver ,check the SMlog . for that exception it will clearly tell you the reason for failure. Mostly it will cause t due to problem in ssh key file ( if router is not reachable from host) or no space left. So check the router is accessible from the host/as well as capacity. Regards Sadhu -----Original Message----- From: tejas.sh...@frontier.in [mailto:tejas.sh...@frontier.in] Sent: Wednesday, April 6, 2016 5:42 PM To: users@cloudstack.apache.org Subject: Re: VR issue High importance Hello venkat, Just increase cpu and mem overcommitment setting in global configuration. Thanks, Tejas Sent from Nine From: kotipalli venkatesh <venkateshcloudt...@gmail.com> Sent: Apr 6, 2016 3:36 PM To: users@cloudstack.apache.org Subject: VR issue High importance Hi All, when we are trying to spin a instance getting the error is "Unable to start a VM due to insufficient capacity" so we have checked storage and RAM it's look enough room place in host. *And also we have checked the management server log we identified that below error message :* 2016-04-05 06:01:35,974 INFO [c.c.v.VirtualMachineManagerImpl] (Job-Executor-114:ctx-9e73f683 ctx-419ad956) Unable to contact resource. com.cloud.exception.ResourceUnavailableException: Resource [DataCenter:1] is unreachable: Unable to apply userdata and password entry on router In this scenario we have rebooted the respected Virtual Router(VR) and then spin a instance successfully deployed. We are thinking that rebooted is not permanent solution and also not good habit. Please guys if anyone facing this situation Please share the proper solution without any impact on existing instances. Regards, Venkatesh.k DISCLAIMER ========== This e-mail may contain privileged and confidential information which is the property of Accelerite, a Persistent Systems business. It is intended only for the use of the individual or entity to which it is addressed. If you are not the intended recipient, you are not authorized to read, retain, copy, print, distribute or use this message. If you have received this communication in error, please notify the sender and delete all copies of this message. Accelerite, a Persistent Systems business does not accept any liability for virus infected mails.