Please check your punchout parameters maintained for the catalog (SPRO->Master Data->Define External Web Services) also check separately if the OCI punchout is happening via the browser.
If you get the Cannot Find Server Error then it means that there is something wrong with the parameters setup.
Also do check if the connection is http:// or https://
It is helpful if you mention the parameters here so that we can see what is wrong.
Thanks.
Prashanth
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