Though tweaking it may be required at some point, I'm not sure it's something that may prevent a freshly installed instance from working. At least I haven't experienced something like this so far. If web UI is inaccessible right after installation, it's more fundamental issue, I believe.
Here is what caught my eye in the logs you provided, Max:
```
2017-10-26 18:24:38,321 ERROR [qtp2008017533-11] [org.xdi.oxauth.exception.UncaughtException] (UncaughtException.java:41) - Jersey error.
java.lang.NullPointerException: null
at org.xdi.net.InetAddressUtility.getMACAddressOrNullImpl(InetAddressUtility.java:57) ~[oxcore-util-3.1.1.Final.jar:?]
at org.xdi.net.InetAddressUtility.getMACAddressOrNull(InetAddressUtility.java:45) ~[oxcore-util-3.1.1.Final.jar:?]
```
Here is what seems to be corresponding block of code: [link1](https://github.com/GluuFederation/oxCore/blob/master/oxUtil/src/main/java/org/xdi/net/InetAddressUtility.java#L43) and [link2](https://github.com/GluuFederation/oxCore/blob/master/oxUtil/src/main/java/org/xdi/net/InetAddressUtility.java#L52). From what I see there, it tries to parse a MAC address of the host on which it runs.
Could you provide output of `# ifconfig -a` from this GCP vm, Max (outside of container)?