Hi Will,
We have restarted OXD on a couple of the Application Servers - which started first time. The oxd.log entries being:
2018-03-12 16:02:32,254 INFO [org.xdi.oxd.server.ServerLauncher] Starting...
2018-03-12 16:02:32,254 INFO [org.xdi.oxd.server.ServerLauncher] commit: 0eda70e831db6c16919ee7cbee4aa90a5fbeb6fa, branch: origin/version_3.0.1, build time:24.02.2017 @ 08:50:18 EST
2018-03-12 16:02:32,707 TRACE [org.xdi.oxd.server.service.ConfigurationService] Try to load configuration from system property: oxd.server.config, value: ../conf/oxd-conf.json
2018-03-12 16:02:32,832 TRACE [org.xdi.oxd.server.service.ConfigurationService] Configuration loaded successfully from system property: oxd.server.config.
2018-03-12 16:02:32,832 TRACE [org.xdi.oxd.server.service.ConfigurationService] Configuration: Configuration{port=8098, timeOutInSeconds=0, jettyPort=0, startJetty=false, localhostOnly=false, useClientAuthenticationForPat=true, useClientAuthenticationForAat=true, trustAllCerts=true, keyStorePath='', keyStorePassword='', licenseId='ee4677ab-e999-4e61-90ae-39232b007372', publicKey='EQ1aCA07CSEezql9GsrBmyRuGsaJH35ndySjFDM5cUp3lF0iL24HtaBDnsSqocDfIb7CBtGOoFznBc5AAlEK36SbeM6NNiQ6pqUF3EYIYnXyM35I46EmQzLdPSJWGIX2PpD/awvvlgnSaBJ99bwuTMV3PFIk6142Vi0aeCosxCaIKqxPbbDkLBF1AnCqoB5KqbtfAt+yUB+8eKHt3TBftQ2EB9tx9YPUtwdgIwxTObMMQw0bL82+pBW7qkyuckSqog2IL4O39QP0RfNjy168Y5WzAAPiiyNoXmPQrqcoyBOcuxCWiLqmQGvHy+aGAZKOgHjvBeW9O06GNQg7jUUUlJ4STec/sYhXvL3OULL3HSjLs5DPLuf+Q/vpiFUIDJsBMjXMqZ6/8870uE9yA8Oe8g==', publicPassword='nqtwIrXf63iW1NxRfYkv', licensePassword='lOfpIGrFGaGSH9jYTf8K', supportGoogleLogout='true', stateExpirationInMinutes='5', nonceExpirationInMinutes='5'}
2018-03-12 16:02:32,926 ERROR [org.xdi.oxd.server.service.ConfigurationService] String index out of range: -1
java.lang.StringIndexOutOfBoundsException: String index out of range: -1
at java.lang.String.substring(Unknown Source)
at org.xdi.oxd.server.service.ConfigurationService.getConfDirectoryPath(ConfigurationService.java:57)
at org.xdi.oxd.server.service.ConfigurationService.getConfDirectoryFile(ConfigurationService.java:44)
at org.xdi.oxd.server.service.SiteConfigurationService.load(SiteConfigurationService.java:61)
at org.xdi.oxd.server.ServerLauncher.startOxd(ServerLauncher.java:84)
at org.xdi.oxd.server.ServerLauncher.start(ServerLauncher.java:62)
at org.xdi.oxd.server.ServerLauncher.main(ServerLauncher.java:51)
2018-03-12 16:02:32,926 INFO [org.xdi.oxd.server.service.ConfigurationService] Configuration directory: C:\oxd-server-3.0.1-distribution\bin\..\conf
2018-03-12 16:02:32,926 TRACE [org.xdi.oxd.server.service.SiteConfigurationService] Loading site file name: oxd-default-site-config.json
2018-03-12 16:02:32,973 DEBUG [org.xdi.oxd.server.license.LicenseFile] License file location: C:\oxd-server-3.0.1-distribution\bin\.oxd-license
2018-03-12 16:02:32,973 TRACE [org.xdi.oxd.server.license.LicenseFile] MAC ADDRESS set to : 00-50-56-AA-6E-97
2018-03-12 16:02:32,973 TRACE [org.xdi.oxd.server.license.LicenseService] Validating license ...
2018-03-12 16:02:32,973 DEBUG [org.xdi.oxd.server.license.LicenseFile] License file location: C:\oxd-server-3.0.1-distribution\bin\.oxd-license
2018-03-12 16:02:32,973 TRACE [org.xdi.oxd.server.license.LicenseFile] MAC ADDRESS set to : 00-50-56-AA-6E-97
2018-03-12 16:02:33,035 TRACE [org.xdi.oxd.server.service.HttpService] Created TRUST_ALL client.
2018-03-12 16:02:34,488 TRACE [org.xdi.oxd.server.license.LicenseService] License is validated successfully.
2018-03-12 16:02:34,488 TRACE [org.xdi.oxd.server.license.LicenseService] License data: LicenseMetadata{creationDate=Wed Mar 07 07:02:12 GMT 2018, licenseId=ee4677ab-e999-4e61-90ae-39232b007372, autoupdate=true, active=true, product=oxd, licenseName='UKFast', expirationDate=Fri Mar 06 07:02:12 GMT 2020, licenseCountLimit=9999, customerName=, emails=[]}
2018-03-12 16:02:34,488 TRACE [org.xdi.oxd.server.license.LicenseService] Validating license ...
2018-03-12 16:02:34,488 DEBUG [org.xdi.oxd.server.license.LicenseFile] License file location: C:\oxd-server-3.0.1-distribution\bin\.oxd-license
2018-03-12 16:02:34,488 TRACE [org.xdi.oxd.server.license.LicenseFile] MAC ADDRESS set to : 00-50-56-AA-6E-97
2018-03-12 16:02:34,488 TRACE [org.xdi.oxd.server.service.HttpService] Created TRUST_ALL client.
2018-03-12 16:02:34,879 TRACE [org.xdi.oxd.server.license.LicenseService] License is validated successfully.
2018-03-12 16:02:34,879 TRACE [org.xdi.oxd.server.license.LicenseService] License data: LicenseMetadata{creationDate=Wed Mar 07 07:02:12 GMT 2018, licenseId=ee4677ab-e999-4e61-90ae-39232b007372, autoupdate=true, active=true, product=oxd, licenseName='UKFast', expirationDate=Fri Mar 06 07:02:12 GMT 2020, licenseCountLimit=9999, customerName=, emails=[]}
2018-03-12 16:02:34,879 INFO [org.xdi.oxd.server.service.SocketService] Server socket is bound to port: 8098, with timeout: 0 seconds. Start listening for notifications.