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This Link Validation (check Link Validation Job here) Job in the Scheduled Job is responsible for generating this report.
If you read details carefully, it says if huge number of pages are found not accessible then it will stop the job. Are you getting 404 link status or something else?
No, the Link Validation job successfully executes everyday without failing. Problem is it reports valid https external links as broken links.
Can you reach the links from your webserver?
If you want the job to stop (trying to) validate the external URLs, you may prevent it with an exclude pattern in web.config:
<linkValidator
maximumRunTime="4:00:00"
recheckInterval="30.00:00:00"
internalLinkValidation="Api">
<excludePatterns>
<add regex="https:\/\/.*"/>
</excludePatterns>
</linkValidator>
The Link Status report contains the valid https external links included in our site content. The link status is "Connection Error".
Is there a way to configure this, that the job can read secure connections properly?