I ran into a similar issue after upgrading a customer from 7.1(3) to 8.5(1)SU2. Basically, when trying to login from various browsers the web page would just hang in the loading phase after authenticating. There are actually a couple of bugs for Web Inbox that, on the surface, either should have been resolved or just didn't seem to apply based on the details. However, I opened a TAC case and was offered either a special ES release (only available from TAC) or the option to upgrade to SU3. Of the two, I opted to just move to SU3 and the issue was resolved. Unfortunately, I pressed for confirmation of a bug ID but was told that, in my case, there was no "formal" bug but the engineer had seen similar cases that were resolved in the same manner.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.