Hi All, there's alot of symptoms to my problem so I'm going to try and list them all and hopefully someone can find the linking cause:
I was getting Tomcat errors on vsphere webclient momentarily after the reboot but that quickly turned to the same 503 as above.
My attempted fixes:
I'm really at a loss here, any help would be grand. Thanks in advance!
Please check KB "503 service unavailable" error when connecting to vSphere Web Client (2121043) and see if this assist on resolving the issue.