Thanks Joshua for your help reviewing this issue.
Reboot all VMs (including your prime client and client0) and try again.
Reboot done on all VMs including PrimeClient & Client0
If you are still seeing an issue: Although you said you only have one NIC on your primeclient I see two IP addresses. You may want to review your networking configuration. Additionally, it would help if you went ahead and posted your Standby0's /etc/hosts file and it's /usr/local/staf/bin/STAF.cfg file for us to review.
PrimeClient has 2 NICs. One of them on the networks connected to the subnet hosting all the VMmark VMs.
Here is the STAF.cfg file(standby0):
[root@primeclient ~]# ssh standby0 "cat /usr/local/staf/bin/STAF.cfg"
# Turn on tracing of internal errors and deprecated options
trace enable tracepoints "error deprecated"
# Enable TCP/IP connections
interface ssl library STAFTCP option Secure=Yes option Port=6550
interface tcp library STAFTCP option Secure=No option Port=6500
# Set default local trust
trust machine local://local level 5
trust machine primeclient level 5
# Add default service loader
serviceloader library STAFDSLS
trust machine 172.21.169.22 level 5
trust machine 172.21.169.17 level 5
trust machine 172.21.169.11 level 5
trust machine 172.21.169.21 level 5
trust machine 172.21.169.12 level 5
trust machine 172.21.169.26 level 5
trust machine 172.21.169.24 level 5
trust machine 172.21.169.18 level 5
trust machine 172.21.169.19 level 5
trust machine 172.21.169.28 level 5
trust machine 172.21.169.23 level 5
trust machine 172.21.169.16 level 5
trust machine 172.21.169.13 level 5
trust machine 172.21.169.27 level 5
trust machine 172.21.169.15 level 5
trust machine 172.21.169.29 level 5
trust machine 172.21.169.25 level 5
trust machine 172.21.169.20 level 5
trust machine 172.21.169.14 level 5
trust machine 172.21.169.30 level 5
trust machine 172.21.166.* level 5
You could also add the alias "primeclient" to the primeclient's /etc/hosts file (with IP 127.0.0.1)
This is done as well.
