Using SAP router string means SAP GUI will first connect through SAProuter and then it will connect and route to SAP Application Server. The SAProuter server should always resides in DMZ zone for security reasons. The requirement is to setup SAProuter (normally you should already have SAProuter connection to SAP OSS) with public IP. It is another option to access SAP GUI connection without using office VPN/network. We use SAProuter string for connections outside of internal LAN and via internet. We leave the SAProuter String empty because we are not using SAProuter for SAP GUI connection.
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Once the work process is assigned, it will check and compare logon user data (user id and password with the user master data which is stored in the database. For example, for user login request, a dialog work process will be assigned if there are work processes available in the system. Based on the concept of FIFO (First In and First Out), the dispatcher will find any free work process based on the user request type and assign it to the user. Once the request is forwarded into ABAP Dispatcher, the request will be kept in the request queue first.