IIS and Helicon ISAPI each request runs twice

under IIS I have installed ISAPI Rewrite Build 81 now I have a problem that almost each request runs twice. But 开发者_运维知识库in my test environment IIS + Helicon ISAPI Bild 47 I don't have such problem.

Any suggestion?

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Please make sure you don’t have double-registration issue: http://www.helicontech.com/articles/isapi_rewrite-double-registration/ Check if Build 81 is the only version of ISAPI_Rewrite installed on the system.