Hi,
If your saprouter string was already configured in working check in sm59 the rfc SAPOSS, SAPOSS rfc is configured via trancsaction code oss1 -> parameter -> technical settings
You will see the router string there.
nice non scn article to look at .
http://www.sapbasisforbeginner.com/2013/09/how-to-troubleshoot-sap-router.html
This explains the router string:
https://help.sap.com/saphelp_nw70/helpdata/en/4f/992df1446d11d189700000e8322d00/content.htm
If your saprouter is on linux/windows CMD command to see string:
Administrative Options - SAProuter - SAP Library
You can run saprouter -l
Hope this helps.
Kind Regards,
Johan