• Status: Solved
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Problem redirecting HTTPS site in iis8.5 / url rewrite 3

Hi all,

I really could use some help from the experts out there...

We use a reverse proxy to publish several http sites to the outside world, all are running fine.

Now I need to give access to an internal HTPPS site.

- internal HTTPS site (https://tobadata.internal.lan)  is accessible from the reverse proxyserver running urlrewrite 3.0, all certifcates are OK, no errors
- certificate for the external url (ess.outside.be) is installed on the rproxy server
- certificate is bound to the specific webserver running on the rproxy server.

I have copied the simple basic rule I normally use for my HTTP sites

                <rule name="ReverseProxyInboundRule1" enabled="true" patternSyntax="Wildcard" stopProcessing="true">
                    <match url="*" />
                        <add input="{HTTPS}" pattern="On" />
                    <action type="Rewrite" url="https://tobadata.internal.lan/{R:0}" />

When using this setup, I'm getting an error "502 - Webserver received an invalid response while acting as a gateway or proxy server"

I have enabled failed request tracing, capturing 502 errors, but this isn't helping me, since it seems that the rewrite rule works as expected?

1. GENERAL_REQUEST_START SiteId="2", AppPoolId="ess", ConnId="1610612741", RawConnId="0", RequestURL="https://ess.outside.be:443/", RequestVerb="GET" 14:36:04.272
2. GENERAL_ENDPOINT_INFORMATION RemoteAddress="", RemotePort="53751", LocalAddress="", LocalPort="443" 14:36:04.288
3. GENERAL_REQUEST_HEADERS Headers="Connection: Keep-Alive
Accept: text/html, application/xhtml+xml, image/jxr, */*
Accept-Encoding: gzip, deflate
Accept-Language: nl-BE
Host: ess.outside.be
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko
" 14:36:04.288
4. GENERAL_GET_URL_METADATA PhysicalPath="", AccessPerms="513" 14:36:04.288
5. HANDLER_CHANGED OldHandlerName="", NewHandlerName="StaticFile", NewHandlerModules="StaticFileModule,DefaultDocumentModule,DirectoryListingModule", NewHandlerScriptProcessor="", NewHandlerType="" 14:36:04.288
6. URL_REWRITE_START RequestURL="/", Scope="Distributed", Type="Inbound" 14:36:04.288
7. RULE_EVALUATION_START RuleName="ReverseProxyInboundRule1", RequestURL="", QueryString="", PatternSyntax="Wildcard", StopProcessing="true", RelativePath="/" 14:36:04.288
8. PATTERN_MATCH Pattern="*", Input="", Negate="false", Matched="true" 14:36:04.288
9. CONDITIONS_EVALUATION_START LogicalGrouping="MatchAll" 14:36:04.288
10. CONDITION_EVALUATION Input="{HTTPS}", ExpandedInput="on", MatchType="Pattern", Pattern="On", Negate="false", Succeeded="true" 14:36:04.288
11. CONDITIONS_EVALUATION_END Succeeded="true" 14:36:04.288
12. REWRITE_ACTION Substitution="https://tobadata.internal.lan/{R:0}", RewriteURL="https://tobadata.internal.lan/", AppendQueryString="true", LogRewrittenURL="false" 14:36:04.288
13. RULE_EVALUATION_END RuleName="ReverseProxyInboundRule1", RequestURL="https://tobadata.internal.lan/", QueryString="", StopProcessing="true", Succeeded="true" 14:36:04.288
14. GENERAL_SET_REQUEST_HEADER HeaderName="X-Original-URL", HeaderValue="/", Replace="true" 14:36:04.288
15. URL_CHANGED OldUrl="/", NewUrl="https://tobadata.internal.lan/" 14:36:04.288
16. URL_REWRITE_END RequestURL="https://tobadata.internal.lan/" 14:36:04.288
17. USER_SET AuthType="", UserName="", SupportsIsInRole="true" 14:36:04.288
18. HANDLER_CHANGED OldHandlerName="StaticFile", NewHandlerName="ApplicationRequestRoutingHandler", NewHandlerModules="ApplicationRequestRouting", NewHandlerScriptProcessor="", NewHandlerType="" 14:36:04.288
19. GENERAL_SET_REQUEST_HEADER HeaderName="Max-Forwards", HeaderValue="10", Replace="true" 14:36:04.288
20. GENERAL_SET_REQUEST_HEADER HeaderName="Host", HeaderValue="tobadata.internal.lan", Replace="true" 14:36:04.288
21. GENERAL_SET_REQUEST_HEADER HeaderName="X-Forwarded-For", HeaderValue="", Replace="true" 14:36:04.288
22. GENERAL_SET_REQUEST_HEADER HeaderName="X-ARR-SSL", HeaderValue="4096|256|C=IL, O=StartCom Ltd., OU=StartCom Certification Authority, CN=StartCom Class 2 IV Server CA|C=BE, S=OV, L=RN, SN=DM, G=T, CN=ess.outside.be", Replace="true" 14:36:04.288
23. GENERAL_SET_REQUEST_HEADER HeaderName="X-ARR-ClientCert", HeaderValue="", Replace="true" 14:36:04.288
24. GENERAL_SET_REQUEST_HEADER HeaderName="X-ARR-LOG-ID", HeaderValue="075dbaec-f845-4e32-985d-3761117ba9ad", Replace="true" 14:36:04.288
25. GENERAL_SET_REQUEST_HEADER HeaderName="Connection", HeaderValue="", Replace="true" 14:36:04.288
26. URL_CHANGED OldUrl="https://tobadata.internal.lan/", NewUrl="/" 14:36:04.303
27. GENERAL_SEND_CUSTOM_ERROR HttpStatus="502", HttpSubStatus="3", FileNameOrURL="502.htm" 14:36:05.366
28. GENERAL_SET_RESPONSE_HEADER HeaderName="Content-Type", HeaderValue="text/html", Replace="true" 14:36:05.381
30. GENERAL_RESPONSE_HEADERS Headers="Content-Type: text/html
Server: Microsoft-IIS/8.5
" 14:36:05.381
31. GENERAL_RESPONSE_ENTITY_BUFFER Buffer="<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"/>
<title>502 - Web server received an invalid response while acting as a gateway or proxy server.</title>
<style type="text/css">
body{margin:0;font-size:.7em;font-family:Verdana, Arial, Helvetica, sans-serif;background:#EEEEEE;}
fieldset{padding:0 15px 10px 15px;}
h3{font-size:1.2em;margin:10px 0 0 0;color:#000000;}
#header{width:96%;margin:0 0 0 0;padding:6px 2% 6px 2%;font-family:"trebuchet MS", Verdana, sans-serif;color:#FFF;
#content{margin:0 0 0 2%;position:relative;}
<div id="header"><h1>Server Error</h1></div>
<div id="content">
 <div class="content-container"><fieldset>
  <h2>502 - Web server received an invalid response while acting as a gateway or proxy server.</h2>
  <h3>There is a problem with the page you are looking for, and it cannot be displayed. When the Web server (while acting as a gateway or proxy) contacted the upstream content server, it received an invalid response from the content server.</h3>
" 14:36:05.381
32. GENERAL_FLUSH_RESPONSE_END BytesSent="1616", ErrorCode="The operation completed successfully.
 (0x0)" 14:36:05.381
33. GENERAL_REQUEST_END BytesSent="1616", BytesReceived="266", HttpStatus="502", HttpSubStatus="3" 14:36:05.381
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1 Solution
Dan McFaddenSystems EngineerCommented:
1. What are you using for a proxy?
2. Is there an SSL cert installed and configured on the destination server for the site?
3. Are there any corresponding Application Event Log entries for this error?

Dan McFaddenSystems EngineerCommented:
I just noticed that you are using ARR, can you post the ARR logs from when the error occurs?

tdemeyerAuthor Commented:
After some extensive trial-and-error (and searching the deep end of Google)  I was able to write a new rule that more or less seemed to work...
tdemeyerAuthor Commented:
Found it elsewhere

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