Removing LDAP binding from Management service
It is running very latest release v14.3.2 build 1171 by the way.......
Figured out a workaround.
As I envisaged the changes made to the server for PCI compliance broke the LDAP integration, on whichever SSL mechanism it was relying upon. In part my fault as I re-entered the LDAP password initially and believe now I most likely did incorrectly!
Having reset the password, setting the connection to to not use SSL has brought back connectivity. Clearly what we have blocked for PCI compliance; the web console LDAP integration is reliant on for comms with AD. I believe the changes have completely blocked the use of SSL v1, also TLS 1.0. The Sweet32 fix disables one of the 3DES SSL cyphers so its something relating.
If it becomes an issue moving forward I'll log a support case. Still frustrating that the attempted deletion of the LDAP config did not behave as per the help file!