Hello everyone. After "March 14, 2017, cumulative update for SharePoint Server 2013 (KB3172497)" I have a problem with opening docs in browser, not on whole farm! Only site collection of project server. I reinstalled office web apps, rebuild bindings... and no result. Please, help.

Error in uls wac-server: WOPI CheckFile: Catch-All Failure [exception:Microsoft.Office.Web.Common.EnvironmentAdapters.FileUnknownException: WOPI 400. Wopi,CheckFile,WACSERVER ---> System.Web.HttpException: BadRequest --- Конец трассировки внутреннего стека исключений --- в Microsoft.Office.Web.Apps.Common.WopiDocument.LogAndThrowWireException(HttpRequestAsyncResult result, HttpRequestAsyncException delayedException) в Microsoft.Office.Web.Common.HttpRequestAsync.End() в Microsoft.Office.Web.Apps.Common.WopiDocument.CheckWopiFile()]

Error in uls wfe-server: System.Web.HttpException: A potentially dangerous Request.Path value was detected from the client. In System.Web.HttpRequest.ValidateInputIfRequiredByConfig () in System.Web.HttpApplication.PipelineStepManager.ValidateHelper (HttpContext context)


2 Answers 2


Found some bug.

Problem solved if I change site URL (project site url) with only english symbols and without spaces. The problem occurs on project sites which url address contains russian symbols and spaces. And sometimes I see an error if I change url adress and use russian symbols and spaces.

Error text in window of web page: A potentially dangerous Request.Path value was detected from the client (:)

Screenshot of error: enter image description here

  • This problem occurs on WHOLE FARM! Not only project sites! Apr 11, 2017 at 14:46
  • Anybody know how to fix this issue? Apr 12, 2017 at 11:33

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