Boot fail after massive "The hostname could not be...
# help-with-umbracok
kdx-perbol
02/07/2025, 10:31 AMWe have an Umbraco 13 Azure web app installation that failed to boot after repeatedly logging
> System.**UriFormatException**: Invalid URI: The hostname could not be parsed.
> at System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind, UriCreationOptions& creationOptions)
> at Umbraco.Cms.Web.Common.Middleware.UmbracoRequestMiddleware.**GetApplicationUrlFromCurrentRequest**(HttpRequest request)
Anyone have spontaneous ideas about the cause? A subsequent app restart worked fine.
And is there a way to see the offending URI?
kdx-perbol
02/07/2025, 10:35 AMHmm, I see that the default hostname is IDN, and we have the non-punycode version in appSettings:
>
"UmbracoApplicationUrl": "https://räksmörgås.azurewebsites.net"kdx-perbol
02/07/2025, 10:36 AMShould we put the punycode
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