I am trying to plan for a physical server migration and have been testing the process to restore a confluence instance from a backup. The first step is to restore to the same version, the migrate to the next "recommended" version. I am able to get the very large backup file restored and get past some admin password issues so that I basically now have a clone. I now want to migrate to a newer version. I am currently at 4.2.13 and have tried to migrate to 5.10.9 (and eventually even higher). The migration install process completed without error, but once Confluence starts, I am not able to access via web browser. It just gives a blank page. Seems there have been other with similar results, but I haven't been able to find an answer that fixes this issue for me.
I would suggest clearing your cache since in the past there have been users using Chrome that this occurred and was fixed with a quick cache clear. If that does not work then check this out as it is most likely the issue - https://confluence.atlassian.com/confkb/getting-a-blank-or-white-screen-when-accessing-confluence-via-browser-318669136.html
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