I did the same, however, the way I had the reverse proxy on IIS to use a sub folder on the domain threw me of.
I was not aware that by using ROOT_URL we could specify the a sub path.
example, if i run the following command inside my meteor app folder:
set ROOT_URL=http://localhost:3100/n/todos && meteor
I will be able to access my app at http://localhost:3100/n/todos, notice I omitted the trailing /. And if we try to surf to the address http://localhost:3100/n or http://localhost:3100/ will give us an error Unknown path.
So, when I first setup the reverse proxy, I was getting the Unknown Path error every time.
Turns out that on my IIS config, I have to specify the http://localhost:3100/n/todos as the url value on the action, please notice the “n/todos” at the end.
So my rewrite rule ended up like this:
[file @ c:/inetpub/wwroot/web.config]
<configuration>
<system.webServer>
<rewrite>
<rules>
<rule name="TODOs meteor app. Route the requests" stopProcessing="true" enabled="true">
<match url="^n/todos/(.*)" />
<conditions>
<add input="{CACHE_URL}" pattern="^(https?)://" />
</conditions>
<action type="Rewrite" url="{C:1}://localhost:3100/n/todos/{R:1}" /> <!-- I was missing the /n/todos here -->
<serverVariables>
<set name="HTTP_ACCEPT_ENCODING" value="" />
</serverVariables>
</rule>
</rules>
<outboundRules>
<rule name="TODOs ReverseProxyOutboundRule1" preCondition="ResponseIsHtml1" enabled="false">
<match filterByTags="A, Area, Base, Form, Frame, Head, IFrame, Img, Input, Link, Script" pattern="^http(s)?://localhost:3100/(.*)" />
<action type="Rewrite" value="/n/todos/{R:2}" />
</rule>
<rule name="TODOs RewriteRelativePaths" preCondition="ResponseIsHtml1" enabled="false">
<match filterByTags="A, Area, Base, Form, Frame, Head, IFrame, Img, Input, Link, Script" pattern="^/(.*)" negate="false" />
<action type="Rewrite" value="/n/todos/{R:1}" />
</rule>
<rule name="ReverseProxyOutboundRule1" preCondition="ResponseIsHtml1">
<match filterByTags="A, Form, Img" pattern="^http(s)?://localhost:3100/(.*)" />
<action type="Rewrite" value="http{R:1}://localhost/{R:2}" />
</rule>
<preConditions>
<preCondition name="ResponseIsHtml1">
<add input="{RESPONSE_CONTENT_TYPE}" pattern="^text/html" />
</preCondition>
</preConditions>
</outboundRules>
</rewrite>
</system.webServer>
</configuration>