# Failed to Add a Router in OpUtils - Unable to Connect

## Problem

When you try to add a router in Switch Port Mapper, Rogue Detection, and MAC IP List tools or from **Admin --> Routers** by specifying the CLI Settings, you get an error as **"Unable to Connect"**.

## Cause

The following checks are performed when a router is added in OpUtils using the CLI Settings:

1. Whether the supplied password and prompt are correct.
2. After verifying this, OpUtils tries to establish a telnet connection with the router. This error message is shown when the router does not accept the connection. One possible reason could be that the maximum concurrent connection limit of that router has been reached.

## Resolution

You can resolve this in the following ways:

1. By closing the existing connections to that router. You can use the TCP Reset Tool in OpUtils to get the details of the current connections and to terminate the connections.
2. By increasing the concurrent connection limit.

**Applies to:** Rogue Detection, Switch Port Mapper, MAC IP List  

**Keywords:** telnet router, cli, max. connection limit, increase limit.

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