ServerManager does not start any MethodServer in Windchill

INFO  [main] wt.server.manager.startup - Registry created: RegistryImpl[UnicastServerRef2 [liveRef: [endpoint:[<host>:5002,wt.boot.WTRMIMasterSocketFactory@1e240](local),objID:[0:0:0, 0]]]]
INFO  [main] wt.server.manager.startup - ServerManager created: ServerManagerImpl[UnicastServerRef2 [liveRef: [endpoint:[<host>:5002,wt.boot.WTRMIMasterSocketFactory@1e240](local),objID:[0:0:0, 5002]]]]
INFO  [main] wt.server.manager.startup - ServerManager bound in registry.
INFO  [main] wt.manager.CacheMasterNegotiator - Cache main stub name: CacheMain
INFO  [main] wt.manager.CacheMasterNegotiator - Using low-locking algorithm
INFO  [main] wt.manager.CacheMasterNegotiator - Main stub retrieved: Proxy[ServerManager,RemoteObjectInvocationHandler[UnicastRef2 [liveRef: [endpoint:[<host>:5002,wt.boot.WTRMIMasterSocketFactory@1e240](remote),objID:[-572b2e27:1967f4cb7af:-7ffe, 3627006938206268236]]]]]

ERROR [main] wt.cache.server.wt.iba.definition.service.IBADefinitionCache  - caught cache server call exception
java.rmi.RemoteException: Unable to register slave cache; nested exception is: 
	java.rmi.RemoteException: Unable to locate cache server; nested exception is: 
	wt.util.WTRemoteException: Unable to get server; nested exception is:
	java.rmi.UnknownHostException: Unknown host: <host>; nested exception is: 
	java.net.UnknownHostException: <host>
	at wt.cache.RemoteCacheServer.registerSlaveInternal(RemoteCacheServer.java:241)
	at wt.cache.RemoteCacheServer.lambda$registerSlave$17(RemoteCacheServer.java:176)
	at wt.cache.RemoteCacheServer.callTimeAndLogRemoteCallableLow(RemoteCacheServer.java:680)
	at wt.cache.RemoteCacheServer.callTimeAndLogRemoteCallable(RemoteCacheServer.java:652)
	at wt.cache.RemoteCacheServer.registerSlave(RemoteCacheServer.java:176)
	at wt.cache.CacheManager.<init>(CacheManager.java:599)
	at wt.iba.definition.service.IBADefinitionCache.<init>(IBADefinitionCache.java:160)
	at wt.iba.definition.service.IBADefinitionCache.getIBADefinitionCache(IBADefinitionCache.java:179)
	at wt.iba.definition.service.IBADefinitionDBService.<clinit>(IBADefinitionDBService.java:91)
	at wt.iba.value.service.IBAValueDBService.<clinit>(IBAValueDBService.java:123)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:264)
	at wt.services.ManagerImplementation.create(ManagerImplementation.java:206)
	at wt.services.StandardManagerFactory.createImplementations(StandardManagerFactory.java:135)
	at wt.services.StandardManagerFactory.<init>(StandardManagerFactory.java:117)
	at wt.services.StandardManagerFactory$Singleton.<clinit>(StandardManagerFactory.java:73)
	at wt.services.StandardManagerFactory.getInstance(StandardManagerFactory.java:102)
	at wt.services.StandardManagerService.createFactory(StandardManagerService.java:373)
	at wt.services.StandardManagerService.initialize(StandardManagerService.java:363)
	at wt.services.StandardManagerService.newStandardManagerService(StandardManagerService.java:99)
	at wt.services.StandardServicesHandler.getFactory(StandardServicesHandler.java:51)
	at wt.services.StandardServicesHandler.start(StandardServicesHandler.java:42)
	at wt.method.MethodServerMain.run(MethodServerMain.java:603)
	at wt.method.MethodServerMain.main(MethodServerMain.java:373)
Caused by: java.rmi.RemoteException: Unable to locate cache server; nested exception is: 
	wt.util.WTRemoteException: Unable to get server; nested exception is:
	java.rmi.UnknownHostException: Unknown host: <host>; nested exception is: 
	java.net.UnknownHostException: <host>
	at wt.cache.RemoteCacheServer.getCacheServer(RemoteCacheServer.java:630)
	at wt.cache.RemoteCacheServer.registerSlaveInternal(RemoteCacheServer.java:190)
	... 23 more
Caused by: wt.util.WTRemoteException: Unable to get server; nested exception is:
	java.rmi.UnknownHostException: Unknown host: <host>; nested exception is: 
	java.net.UnknownHostException: <host>
	at wt.manager.RemoteServerManager.remoteInvoke(RemoteServerManager.java:486)
	at wt.manager.RemoteServerManager.getServer(RemoteServerManager.java:278)
	at wt.manager.RemoteServerManager.getServer(RemoteServerManager.java:262)
	at wt.cache.RemoteCacheServer.getCacheServer(RemoteCacheServer.java:610)
	... 24 more
Caused by: java.rmi.UnknownHostException: Unknown host: <host>; nested exception is: 
	java.net.UnknownHostException: <host>
	at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:616)
	at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:216)
	at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:202)
	at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:129)
	at wt.manager.ServerManagerImpl_Stub.getServer(Unknown Source)
	at wt.manager.RemoteServerManager.lambda$getServer$28(RemoteServerManager.java:279)
	at wt.manager.RemoteServerManager.remoteInvoke(RemoteServerManager.java:449)
	... 27 more
Caused by: java.net.UnknownHostException: <host>
	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)
	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
	at java.net.Socket.connect(Socket.java:589)
	at java.net.Socket.connect(Socket.java:538)
	at java.net.Socket.<init>(Socket.java:434)
	at java.net.Socket.<init>(Socket.java:211)
	at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:40)
	at wt.boot.AsyncConnector.runConnector(AsyncConnector.java:120)
	at wt.boot.AsyncConnector.lambda$run$0(AsyncConnector.java:88)
	at java.security.AccessController.doPrivileged(Native Method)
	at wt.boot.AsyncConnector.run(AsyncConnector.java:85)

INFO  [Thread-3] wt.system.err - java.io.IOException: Server returned HTTP response code: 503 for URL: http://<Windchill_Hostname>/Windchill/wt.properties
INFO  [Thread-3] wt.system.err -     at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1626)
INFO  [Thread-3] wt.system.err -     at java.net.URL.openStream(URL.java:1037)
INFO  [Thread-3] wt.system.err -     at wt.boot.WTRMIHttpToCodebaseSocketFactory$1.run(WTRMIHttpToCodebaseSocketFactory.java:169)
INFO  [Thread-3] wt.system.err -     at wt.boot.WTRMIHttpToCodebaseSocketFactory$1.run(WTRMIHttpToCodebaseSocketFactory.java:159)
INFO  [Thread-3] wt.system.err -     at java.security.AccessController.doPrivileged(Native Method)
INFO  [Thread-3] wt.system.err -     at wt.boot.WTRMIHttpToCodebaseSocketFactory.getJavaRMI(WTRMIHttpToCodebaseSocketFactory.java:157)
INFO  [Thread-3] wt.system.err -     at wt.boot.WTRMIHttpToCodebaseSocketFactory.createSocket(WTRMIHttpToCodebaseSocketFactory.java:71)
INFO  [Thread-3] wt.system.err -     at wt.boot.AsyncConnector.runConnector(AsyncConnector.java:103)
INFO  [Thread-3] wt.system.err -     at wt.boot.AsyncConnector.access$000(AsyncConnector.java:24)
INFO  [Thread-3] wt.system.err -     at wt.boot.AsyncConnector$1.run(AsyncConnector.java:91)
[Thread-3] wt.system.err -     at wt.boot.AsyncConnector$1.run(AsyncConnector.java:87)
[Thread-3] wt.system.err -     at java.security.AccessController.doPrivileged(Native Method)
INFO  [Thread-3] wt.system.err -     at wt.boot.AsyncConnector.run(AsyncConnector.java:85)
INFO  [main] wt.manager.CacheMasterNegotiator - Master stub retrieved: ServerManagerImpl$MasterServerManagerImpl_Stub[UnicastRef2 [liveRef: [endpoint:[<Source_Hostname>:5002,wt.boot.WTRMIMasterSocketFactory@1e240](remote),objID:[-12edfc31:14df83f32aa:-7ffd, 8702960912329086855]]]