The SSL cert nickname has to be mentioned under the SSL element, the default is s1as. Did you change that to wfgfcert :
look for the ssl element in domain.xml (as a child of the http-listener corresponding to port 8181)
<ssl ssl3-enabled="false" cert-nickname="s1as" ...../>
If you think you have already done that then can you do the following and paste the listing here :
keytool -export -file wfgfcert.crt -keystore keystore.jks -storepass <password> -alias wfgfcert
keytool -printcert -file wfgfcert.crt
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