fixed issue with access denied condition thanks to @pho_bos

msf  auxiliary(sap_router_info_request) > run

[+] 172.16.252.142:3299 - Connected to saprouter
[+] 172.16.252.142:3299 - Sending ROUTER_ADM packet info request
[+] 172.16.252.142:3299 - Got INFO response
[-] 172.16.252.142:3299 - Access denied

[*] Scanned 1 of 1 hosts (100% complete)
[*] Auxiliary module execution completed

msf  auxiliary(sap_router_info_request) > run

[+] 172.16.252.142:3299 - Connected to saprouter
[+] 172.16.252.142:3299 - Sending ROUTER_ADM packet info request
[+] 172.16.252.142:3299 - Got INFO response
[-] 172.16.252.142:3299 - No connected clients
[+] Working directory   : /home/sap
[+] Routtab             : routtab

[*] Scanned 1 of 1 hosts (100% complete)
[*] Auxiliary module execution completed

msf  auxiliary(sap_router_info_request) > run

[+] 172.16.252.142:3299 - Connected to saprouter
[+] 172.16.252.142:3299 - Sending ROUTER_ADM packet info request
[+] 172.16.252.142:3299 - Got INFO response
[+] Working directory   : /home/sap
[+] Routtab             : routtab


[SAP] SAProuter Connection Table for 172.16.252.142
===================================================

   Source          Destination     Service
   ------          -----------     -------
   atreides.local  172.16.252.147  22

[*] Scanned 1 of 1 hosts (100% complete)
[*] Auxiliary module execution completed