vcsa7.0加入AD域时提示“Idm client exception: Error trying to join AD, error code 2453”
参考：https://communities.vmware.com/t5/vCenter-Server-Discussions/Idm-client-exception-Error-trying-to-join-AD-error-code-2453/m-p/1825912?tstart=0
解决办法：
查看dns是否设置正确，如下：
1. Enable SSH on VCSA.
2. Command> shell
3. # /opt/vmware/share/vami/vami_config_net
4. Set the right DNS (Option 4)
5. # /opt/likewise/bin/domainjoin-cli join domainname username password
6. reboot
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3. # /opt/likewise/bin/domainjoin-cli leave
4. reboot