Just for information, no need to download zlib as the CSP gateway installs it. This issue was down to a dependency issue on windows 2012 as a result I had to install "MS VC++ 2013 redistributable". Thanks to Bernd Mueller as Intersystems wrc.
Just noticed the inetpub\cspgatway directory contains a zlib1.dll, I have therefore copied this to zlib.dll based on the documentation but still no luck. Did you use the version from zlib or the version in the csp gateway and can you confirm the name of the file.
Just downloaded the zlibwapi.dll 32 bit renamed it to zlib.dll and placed it in the windows\system32 directory, however after restarting iis the csp gateway is not finding it.
I will investigate further and then log a wrc call.
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