NextPVR webserver not starting, prevents client from starting

[mvallevand]

Did you ever try and edit web.config or add something to it?

Also I am curious what is being encrypted does this give the same error?

Code:

curl 'http://127.0.0.1:8866/service?method=session.initiate&ver=1.0&device=xbmc'

Martin

[homemaisonbaile]

I get the same output running curl locally on the service page. Error 500.

Code:

LivingRoom:~/.kodi/addons/service.nextpvr/nextpvr-bin # curl -v 'http://127.0.0.1:8866/service?method=session.initiate&v
er=1.0&device=xbmc'
*   Trying 127.0.0.1:8866...
* Connected to 127.0.0.1 (127.0.0.1) port 8866
> GET /service?method=session.initiate&ver=1.0&device=xbmc HTTP/1.1
> Host: 127.0.0.1:8866
> User-Agent: curl/8.6.0
> Accept: */*
>
< HTTP/1.1 500 Internal Server Error
< Content-Type: text/plain; charset=utf-8
< Date: Tue, 04 Feb 2025 14:04:42 GMT
< Server: Kestrel
< Transfer-Encoding: chunked
<
System.Security.Cryptography.CryptographicException: An error occurred while trying to encrypt the provided data. Refer to the inner exception for more information.
---> System.Xml.XmlException: Root element is missing.
   at System.Xml.XmlTextReaderImpl.Throw(Exception e)
   at System.Xml.XmlTextReaderImpl.ThrowWithoutLineInfo(String res)
   at System.Xml.XmlTextReaderImpl.ParseDocumentContent()
   at System.Xml.XmlReader.MoveToContent()
   at System.Xml.Linq.XElement.Load(XmlReader reader, LoadOptions options)
   at System.Xml.Linq.XElement.Load(Stream stream, LoadOptions options)
   at Microsoft.AspNetCore.DataProtection.Repositories.FileSystemXmlRepository.ReadElementFromFile(String fullPath)
   at Microsoft.AspNetCore.DataProtection.Repositories.FileSystemXmlRepository.GetAllElementsCore()+MoveNext()
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at Microsoft.AspNetCore.DataProtection.Repositories.FileSystemXmlRepository.GetAllElements()
   at Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager.GetAllKeys()
   at Microsoft.AspNetCore.DataProtection.KeyManagement.KeyRingProvider.CreateCacheableKeyRingCore(DateTimeOffset now, IKey keyJustAdded)
   at Microsoft.AspNetCore.DataProtection.KeyManagement.KeyRingProvider.GetCurrentKeyRingCore(DateTime utcNow, Boolean forceRefresh)
   at Microsoft.AspNetCore.DataProtection.KeyManagement.KeyRingBasedDataProtector.Protect(Byte[] plaintext)
   --- End of inner exception stack trace ---
   at Microsoft.AspNetCore.DataProtection.KeyManagement.KeyRingBasedDataProtector.Protect(Byte[] plaintext)
   at Microsoft.AspNetCore.Session.CookieProtection.Protect(IDataProtector protector, String data)
   at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddlewareImpl.Invoke(HttpContext context)

HEADERS
=======
Accept: */*
Host: 127.0.0.1:8866
User-Agent: curl/8.6.0
* Leftovers after chunking: 12 bytes
* Connection #0 to host 127.0.0.1 left intact

No I have not edited web.config, I see opening it up now that it is structured as an XML and that there are three space characters at the beginning of the file before the XML declaration, but removing the three spaces makes no difference.

Is there another debug variable I can enable to output what the path of the XML with the supposed missing root is?

[mvallevand]

You removed the BOM utf-8 marker it was created on on Windows machine I can't even get NextPVR to read the web.config that is provided.

I am guessing that the problem is you are running multiple web servers (I saw three others running) there might be confusing web.config I think you would find on a cleaner install like mine it would work.

Martin

[mvallevand]

Check the files in /storage/.aspnet/DataProtection-Keys I think there is a bad file in there.

Martin

[homemaisonbaile]

You removed the BOM utf-8 marker it was created on on Windows machine  I can't even get NextPVR to read the web.config that is provided.

I am guessing that the problem is you are running multiple web servers (I saw three others running) there might be confusing web.config I think you would find on a cleaner install like mine it would work.

Martin

I reverted the file after I saw it made no difference. Just to be clear are you referring to the file in ~/.kodi/addons/service.nextpvr/nextpvr-bin? I have attached it here.

[homemaisonbaile]

Check the files in /storage/.aspnet/DataProtection-Keys  I think there is a bad file in there.

Martin

Brilliant, working now. There was one key file in there which was empty, removing it and restarting the service instantly brought up the webserver.

Thank you so much for all the help! Everything seems to be working as normal now, the related errors have disappeared and NextPVR is now recognised as the PVR backend.

Code:

C:\Users\admin>curl -v http://192.168.1.100:8866/
*   Trying 192.168.1.100:8866...
* Connected to 192.168.1.100 (192.168.1.100) port 8866
> GET / HTTP/1.1
> Host: 192.168.1.100:8866
> User-Agent: curl/8.9.1
> Accept: */*
>
< HTTP/1.1 302 Found
< Content-Length: 0
< Date: Tue, 04 Feb 2025 15:29:02 GMT
< Server: Kestrel
< Cache-Control: no-cache,no-store
< Expires: -1
< Location: login.html?salt=f766f371-a2d5-4f64-94c2-c62e88d69a11
< Pragma: no-cache
< Set-Cookie: .AspNetCore.Session=CfDJ8CPgjTaFT6VIur%2BaukEiqLfM%2BgglxNnlB6mn1Rq4FfZPJ0VOfSwpaLU4ymWHyRZmdJBMl5KbXvAVLYxNetH0q%2FLuVzbTRMrUye4wGDfIpeM3%2FTLlBbrSfpVULSJqNnw07%2F%2FWt0WA1FxtSq8zW5Z%2BOpr%2FxSYU1KPILon2zJf2C4zN; path=/; samesite=lax; httponly
<
* Connection #0 to host 192.168.1.100 left intact

[mvallevand]

Thanks for the outstanding help on your end, trying so many things. This can actually happen in any environment, unfortunately you were the first one to request help on it.

Martin

[sub]

Great. Glad you got it sorted.

[mvallevand]

For future reference some of the other locations to check for bad XML files on other platforms are

Windows C:\Windows\System32\config\systemprofile\AppData\Local\ASP.NET\DataProtection-Keys or
C:\Users\%username%\appdata\Local\ASP.NET\DataProtection-Keys

Linux deb installer. /root/.aspnet/DataProtection-Keys/

They aren't created by NextPVR and many I checked are expired too but if one is bad the web server won't work.

Martin