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Graylog indices page fails with error 'Reason: Could not get indices. We expected HTTP 200, but got a HTTP -1.'

When many indices are used in Graylog you can experience an error stating that a HTTP -1 response was received. This error can  be caused by a timeout when collecting information about indices. I changed the timeout to 30 seconds and restarted the graylog web service. Then waited a few minutes and the error was gone: Change timeout settings in /etc/graylog/web/web.conf: # Global timeout for communication with Graylog server nodes; default: 5s timeout.DEFAULT=30s Restart web service: service graylog-web restart