If you have forwarded the router correctly then you should see something in the apache access log or the apache error log. In the error log probably you shouldl see the extenal ip address and an message saying rejected due to server configuration.
Its possible that your ISP is blocking port 80 so to test if thats the case
1. change your routers port forwarding so that incoming port 8888 is forwarded to port 80 on your WAMPServer PC (ip address)
Dont change Apache's Listening port leave that at 80.
Now get someone to try accessing your routers WAN ip address like this
'http://11.22.33.44:8888' ( without the single quotes )
This may get through but again check Apache Access and Error logs to see if you see anything from the external ip address.
Report back either way, thanks
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