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We have a Sitecore 10.2 site hosted on Azure App services. Very often site is getting down with the blank page throwing error Unable to connect remote server. If we refresh multiple times, then site will be up but it will keep on coming same error till we restart the service.

This behaviour has been observed over QA and Pre-prod environments also.

Any possible way to fix this issue?

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After doing a lot of workaround on this issue, we finally resolved the issue with the suggestion from Sitecore Support Team.

Basically this was a JSS issue where it is unable to render the page.The issue occurs in cases when the JSS application works in the Integrated Mode.

As per the Sitecore Article https://support.sitecore.com/kb?id=kb_article_view&sysparm_article=KB1000535

Setting the value of the "ConnectFailureNodeRestart" configuration to "true" on all of your Sitecore instances, resolved my issue.

By default, the property is defined in the following file: App_Config\Sitecore\JavaScriptServices\Sitecore.JavaScriptServices.ViewEngine.Node.config. You can also set the value by creating a configuration patch file in the \App_Config\Include\zzz folder.

Note: It is always a best practise to have all default configuration changes through patch config.

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