Hi Francis,
Please test the service with only:
~TRANSACTION ZZZZZZ
~WEBGUI 1
SAP-IE EmulateIE8
If it works, then add:
~WEBGUI_SIMPLE_TOOLBAR 32
~NOHEADEROKCODE 1
The parameters:
~WEBTRANSACTIONTYPE EWT
~PASSWORD
~TIMEOUT 10
should not be used (deprecated ones).
There are more parameters in the list: I recommend reading about each one of them before using - you can have odd results mixing parameters.
Regards,
Cris