AT DST we use a product called End User Experience Monitor(EUEM), which is a network monitor. It’s watching traffic to Confluence from users throughout the company. It is detecting errors in that traffic. It is not, itself, accessing Confluence. There is something in the Confluence code which is setting an HTML return code of 3000. The industry standard is to return a zero or a 200 if all works according to expectation. A code of 3000 is generally understood to be an error code. EUEM is seeing Confluence returning a 3000 and is flagging this as a page returning in error. We are not getting reports that Confluence is having problem from the end users so why are we getting these return codes of 3000?
The best thing to do in order to check Confluence's behavior is, in fact, check its logs.
Maybe this code is appearing since the tool doens't have access to your Confluence pages, regarding restrictions. So it doesn't mean that Confluence is having any issue, just that the tool cannot access every page for security reasons.
Either way, when you experience this again, I suggest you to check the atlassian-confluence.log, on the same timestamp to check if confluence generates any errors or warnings.
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