I'm in the process of performing an upgrade of Sitecore 8.1 update 3 to Sitecore 9.0.1.

I have updated all the Sitecore nuget package references from 8.1 to their counterparts in 9.

When I run the site I get the following exception:

Could not resolve type name: Sitecore.Data.SqlServer.SqlServerProxyDataProvider, Sitecore.Kernel (method: Sitecore.Configuration.DefaultFactory.CreateFromTypeName(XmlNode configNode, String[] parameters, Boolean assert)).

When I decompile Sitecore.Kernel v8.1 I can see that the type in questions exists.

When I decompile Sitecore.Kernel v9 they type is no longer there.

Does anyone know where it has gone and / or what I should be using instead?

  • Where are you using SqlServerProxyDataProvider or where is it referenced from? I couldn;t find any reference in config files in OOTB instance of Sitecore 8. Jun 14, 2018 at 11:24
  • I couldn't find SqlServerProxyDataProvider anywhere in the code. I did note however that the sitecore.config had an element of proxyDataProvider whereas a fresh v9 install had dataProvider instead. Changed the config and it got past this issue. Looks like I will have more luck starting from a fresh v9 config and going from there. Thanks for your help.
    – schnitty
    Jun 15, 2018 at 0:20
  • You can also accept my answer @schnitty if it helped :) Jul 10, 2018 at 18:42

2 Answers 2


Seems that the whole Sitecore.Data.Proxies namespace has been significantly reduced in Sitecore 9.

There is also no ProxyDisabler any more as it has been retired in this version -> https://briancaos.wordpress.com/2018/01/22/in-sitecore-9-the-proxydisabler-have-been-retired-completely/

I believe there is no replacement for Sitecore.Data.SqlServer.SqlServerProxyDataProvider or any other ProxyProviders that were there before as Proxy items are no longer supported in Sitecore 9.


to resolve issue do action as below

From the Sitecore.config comment below settings for keys both below entries came twice, so ensure to comment twice proxiesEnabled proxyDataProvider

comment below tag proxyDataProviders

  • This doesn't answer the question Jan 7, 2020 at 10:28

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