How to configure a SAP router string in SAP Logon

Many SAP systems sit behind a saprouter — a gateway that controls access between networks. To reach them from SAP GUI you add a router string to the connection. This guide explains the format and how to set it up.

What a router string looks like

A router string is a chain of hops, each in the form /H/host/S/service, where /H/ introduces a host and /S/ an optional port. A single-hop example:

/H/saprouter.example.com/S/3299

3299 is the standard saprouter port. If traffic passes through more than one router, the hops are chained left to right, ending at the target system. The application server itself is then reached at its own host and port.

Step 1 — Open the connection properties

In SAP Logon, select the system entry and open its properties (right-click → Properties, or edit it when creating a new entry). Go to the Connection tab.

Step 2 — Enter the router string

There's a field for the SAP router string. Paste the string your Basis team gave you. SAP GUI combines it with the application-server (or message-server) details you enter, so the client knows to tunnel through the router to reach the system.

Get the exact router string from your Basis or network team — the host names, ports and order all matter. A single wrong character means the connection won't establish.

Step 3 — Save and test

Save the entry and double-click to connect. If it fails, check the router string for typos, confirm the saprouter is reachable from your network, and verify the port (usually 3299) isn't blocked by a firewall.

Why the router matters when you move machines

When you copy your system list to another PC, systems behind a router only work if the router string travels with them. Copying just the raw entry can lose that link. SAP Logon Transfer resolves and carries router references automatically, so a system that needs a saprouter keeps working on the new machine — see moving SAP GUI to a new computer.

Troubleshooting

• "partner not reached" — the saprouter host/port may be wrong or blocked; confirm with your network team.
• Connection works for colleagues but not you — your machine may not have network access to the saprouter, or you're missing VPN.
• Router string disappears after moving PC — the reference wasn't carried; re-add it or use a tool that preserves router links.