Profile Parameters for Reverse Invoke with SAP Web Dispatcher
The following parameters are used for a reverse invoke configuration of the SAP Web Dispatcher:
| Parameter | Description | Default |
|---|---|---|
| ms/server_port | Must point to the reverse invoke service from the message server. You can use this parameter to specify the service or port that is to be used for a protocol. Valid protocols are HTTP and HTTPS. You can find a detailed description of the syntax in the documentation of profile parameter icm/server_port_<xx>. The message server ignores any TIMEOUT and VCLIENT additions that are not relevant for it. | - |
| rdisp/mshost | Must point to the reverse invoke service from the message server. This parameter specifies the host on which the message server is running. This entry must be the same on all application servers belonging to one SAP system and for this reason it should be set only in the default profile. The name of the host must be defined in the hosts database. | $(SAPMSHOST) |
| wdisp/max_servers | This parameter determines the maximum number of entries in the SAP Web Dispatcher's server table. | 128 |
| wdisp/reverse_invoke | activates and deactivates reverse invoke. FALSE causes the Web Dispatcher to open connections as before to the ICM and to the message server. TRUE causes the connection to be opened by the ICM or the message server. This means no TCP/IP connections can be opened by the Web Dispatcher. | FALSE |
| wdisp/ri/acl_<xx> | (character string): These access control entries are used to explicitly name the host on which the message server and ICMs are running. Only these are allowed to open connections to the Web Dispatcher. As with the SAProuter, the entries are P (permit) and D (deny). The letter is followed by an IP address or a host name. IP address masks can also be specified. | - |
| wdisp/ri/client_host | (host name / IP address): If the listener for the connections between the ICM and the message server is to listen on a specific interface (IP address). This parameter corresponds to the HOST option of the ICM/Web Dispatcher parameter icm/server_port_<xx>. | - |
| wdisp/ri/client_serv | The port number which the message server and ICM are to connect to. | - |
| wdisp/ri/pool_size | The number of connections that are held in a pool in order to speed up the connection setup. | 5 |
| wdisp/ri/use_ssl | This parameter must be set to TRUE if you want to use SLL to open the RI connection and therefore it specifies a host name for the individual servers in the ACL. | FALSE |
Check RI Connection
You can use program netstat to check whether the connections really are open from the ICM or the message server to the Web Dispatcher. (In the example above with the Web dispatcher, netstat -an | grep 7010).