Nginx reverse proxy probleme with Rewrite

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http://serverfault.com – My plateform is a reverse proxy with nginx and a web site on IIS. I have a 502 error with nginx. 2013/01/22 12:19:03 [error] 3842#0: *37 recv() failed (104: Connection reset by peer) while reading response header from upstream, client:, server: www.mydomaine.com, request: "GET /MosStyle/aspx/arboStyle.aspx?style=irlande&refDossierStyle=../../MosData/MosStyle/styles/irlande/ HTTP/1.1", upstream: "", host: "www.mydomaine.com" The problem is with the '../. (HowTos)