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3205256 - HTTP error during proxy handshake


The SAP Web Dispatcher is configured to use PROXY to access External System, like:
wdisp/system_X = SID=<SID>, EXTSRV=<External System>, SRCURL=/XXX/, SRCSRV=*:*, PROXY=<proxy host>:<port> 

"503 Service Not Available -- HTTP error during proxy handshake" error occurs when access the External System through SAP Web Dispatcher:

Meanwhile, following error can be seen in web dispatcher trace file (dev_webdisp):
[Thr XXXX] *** ERROR => IcmConnPoolConnect: IcmConnProxyHandshake failed (-62) [icxxpool.c   XXXX]
[Thr XXXX] ***LOG IM7=> HttpRouteHandler, AttachToServer (&) [http_route.c XXXX]



SAP Web Dispatcher


407 Proxy Authentication Required  IcmConnProxyHandshake , KBA , BC-CST-WDP , Web Dispatcher , Problem

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