I have set up a web site (www.mysite.com) on IIS to provide SSL and Windows Auth, and to forward all HTTPS requests to another server (BIOS name: internalserver; port 2080). The rule specifying this setup reads:
<?xml version="1.0" encoding="UTF-8"?> <configuration> <system.webServer> <rewrite> <outboundRules> <preConditions> <preCondition name="ResponseIsHtml1"> <add input="{RESPONSE_CONTENT_TYPE}" pattern="^text/html" /> </preCondition> </preConditions> </outboundRules> <rules> <rule name="ReverseProxyInboundRule1" stopProcessing="true"> <match url="(.*)" /> <action type="Rewrite" url="http://InternalServer:2080/{R:1}" /> </rule> </rules> </rewrite> </system.webServer> </configuration>This is leading to the following behavior (reproducible in both IExplorer and Firefox):
Clicking www.mysite.com results in Error 502 "Web server received an invalid response while acting as a gateway or proxy server"
Reloading the page causes the site to load - but unformatted, suggesting that the CSS files were not found.
Reloading the page a second time causes the site to load correctly, including CSS-specified formats.
The Error 502 reappears each time the browser is closed and relaunched.
On the other hand, if I use Basic Auth instead of Windows Auth, the reverse proxy works just fine, with none of the above issues coming up.
My questions are:
- is the emergence of Error 502 known in this type of configuration known?
- does this represent a bug in IIS?
- if not, is any interaction with other software known to produce this issue?