Hello DSpace community,
I’m reaching out with a question about installation DSpace 9.2 and 
troubleshooting an issue.
This is our test environment and my first time practical experience, so I 
apologize in advance for any trivial mistake I may have missed.
We have DSpace in version 9.2, where are hosted backend and frontend on the 
same server. We are not not using HTTPS.
When I will open user Interface, web pages are showing, but a few second 
later it is redirect to error message 500
Error message:
"500 Service unavailable The server is temporarily unable to service your 
request due to maintenance downtime or capacity problems. Please try again 
later."
I cannot log in to the system; only the DSpace language locale can be 
changed.
I checked possible problems on wiki webpages, but I received from console 
200.

REST API from the UI from the command-line
npm run test:rest

ubuntu@dm4ai-test:/opt/dspace-angular$ npm run test:rest

> [email protected] test:rest
> ts-node --project ./tsconfig.ts-node.json scripts/test-rest.ts

Building production app config
Overriding app config with /opt/dspace-angular/config/config.yml
Unable to find env config file at 
/opt/dspace-angular/config/config.production.yaml
...Testing connection to REST API at http://localhost:8080/server/api...

RESPONSE: 200

Checking JSON returned for validity...
        "dspaceVersion" = DSpace 9.2
        "dspaceUI" = http://localhost:4000
        "dspaceServer" = http://localhost:8080/server
        "dspaceServer" property matches UI's "rest" config? true
        Does "/api" endpoint have HAL links ("_links" section)? true
ubuntu@dm4ai-test:/opt/dspace-angular$

Server Api is accesible
http://localhost:8080/server/api

http://localhost:8983/solr/#/ is also ok
In developer tools is error message:
[image: Dspace_01.png]
 

Thank you for any advice and tips on what I should check next and where to 
look.

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