Getting error while adding client in chef server and Chef-server-ctl test giving error

I am able to bootstrap the node from workstation but while registering node and client from VRA workflow using CHEF API . Encountering error with registering client from CHEF API and even separately adding node is working but adding client is failing from workstation

++++++Workstation Logs+++++++++++++++

PS C:\Users\chef-repo> knife client create win-testing-node
ERROR: Server returned error 503 for https://xyz, ret
ying 1/5 in 3s
ERROR: Server returned error 503 for https://xyz, ret
ying 2/5 in 5s
ERROR: Server returned error 503 for https://xyz, ret
ying 3/5 in 13s
ERROR: Server returned error 503 for https://xyz, ret
ying 4/5 in 21s

###################################################################

+++++++++Chef server logs++++++++++++++++
[root@b opscode]# chef-server-ctl test
Configuring logging...
Creating platform...
Configured server URL: https://xyz
Configured base resource URL: https://xyz
Creating org pedant_testorg_pobu02lx00130b_33093
Failed attempting to contact https://xyz (0/5)
Failed attempting to contact https://xyz (1/5)
Failed attempting to contact https://xyz (2/5)
Failed attempting to contact https://xyz (3/5)
Failed attempting to contact https://xyz (4/5)
bundler: failed to load command: ./bin/oc-chef-pedant (./bin/oc-chef-pedant)
RuntimeError: Failed attempting to contact https://xyz 5 times
/opt/opscode/embedded/service/oc-chef-pedant/lib/pedant/platform.rb:364:in create_org' /opt/opscode/embedded/service/oc-chef-pedant/lib/pedant/platform.rb:147:inorg_from_config'
/opt/opscode/embedded/service/oc-chef-pedant/lib/pedant/platform.rb:48:in initialize' /opt/opscode/embedded/service/oc-chef-pedant/lib/pedant.rb:83:innew'
/opt/opscode/embedded/service/oc-chef-pedant/lib/pedant.rb:83:in create_platform' /opt/opscode/embedded/service/oc-chef-pedant/lib/pedant.rb:59:insetup'
/opt/opscode/embedded/service/oc-chef-pedant/bin/oc-chef-pedant:10:in `<top (required)>'

please look into this and let me know

I am also seeing this error in my env. I have increased the RAM to 4 GB and have reconfigured chef server. It did not help me

I just restore the server in some days back before doing this just puls out the data of node and other data to make it up to date later.When restore server will be functional. Have you installed mcafee or any agent from that time it is causing the error.