You can authenticate a user on a Portal and then use the SSO2 ticket to authenticate the user to NWBC. For SAP GUI you might be able to use open source Kerberos or free SNC library (if SAP system is on Windows Server). The time and effort required to set this up will be high and you won't get much help so unless you know what you are doing you will find it takes a lot of time to get it working. if you buy a product then you will get the help you need to make it work quickly. It is also possible to buy a product that works with any Kernel version including 7.1 so any issues with kernel dependancies are not an issue anymore. I strongly suggest you advise your client to spend some money so they get a good product and good support from the vendor. If you use free technology, when users cannot logon anymore you won't be able to get help form anybody as quickly as you need so the users and hence the business will suffer from lack of user productivity.
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