[Alpha] Connection to database immediately closes when signing in as a guest user

[CodeByDrescher]

This is the error reported when trying to open any database model as a guest:

FailToLoadDocumentExc-Failed to load document. Possible reasons :
1. You are no longer connected to the server. Reconnect in order to retrieve model. 
2. You previously saved this model using a newer version of VCell. Open model in that version.
(run=Alpha_Version_7.7.0_build_39, doc=Rel_Version_7.5.0_build_25)
RuntimeException-com.fasterxml.jackson.core.JsonParseException: Unexpected character ('<' (code 60)): expected a valid value (JSON String, Number, Array, Object or token 'null', 'true' or 'false')
 at [Source: (jdk.internal.net.http.ResponseSubscribers$HttpResponseInputStream); line: 1, column: 2]
JsonParseException-Unexpected character ('<' (code 60)): expected a valid value (JSON String, Number, Array, Object or token 'null', 'true' or 'false')
 at [Source: (jdk.internal.net.http.ResponseSubscribers$HttpResponseInputStream); line: 1, column: 2]

Note that vcell notices the disconnect every 10 seconds, successfully connects, but seems to disconncet immediately...the client doesn't notice until 10 seconds later.