Though there are several ports that SAP application uses, following are the basic ones you would like to know :
| Service | SAP standard Port Number/Service Name | Range | Description | request type |
| Dispatcher | sapdpNN/32NN | 3200-3299 | SAP dispatcher port for SAP GUI for windows and Java | incoming |
| gateway | sapgwNN/33NN | 3300-3399 | SAP gateway for CPIC and RFC | incoming |
| ICM Server HTTP port | 80NN | SAP ABAP Web AS HTTP port | incoming | |
| ICM Server HTTPs port | 443NN | SAP ABAP Web AS HTTPS port | incoming | |
| ICM server SMTP port | 25 | Mail communication with SAP | incoming | |
| Message server | 36NN/sapmsSID | TCP/IP port of SAP message server | incoming | |
| Message server HTTP port | 81NN | HTTP port for SAP message server | incoming | |
| Message server HTTPS port | 444NN | HTTPS port for SAP message server | incoming |
You can change the HTTP and HTTPS port of ICM server by changing the relevant ICM parameters.
Similarly it is also possible to change the HTTP and HTTPS port used by message server by changing the relevant message server parameters.
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