Hi Jalpa,

Thanks for your help, I tried the above using (change site names):

<rule name="site1.com.au" stopProcessing="true">
<match url=".*" />
<conditions logicalGrouping="MatchAll" trackAllCaptures="false">
<add input="{HTTP_HOST}" pattern="^www.site1.com.au$" />
<add input="{REQUEST_URI}" pattern="awards" negate="true" />
</conditions>
<action type="Redirect" url="https://www.site2.com.au/ {R:0}" />
</rule>

and I get a result of: 

https://www.site2.com.au/%20awards

which receives a page not found error, thanks again, could it be the DNS causing this?

Cheers

Alex