Right now the "Maximum time between two startup attempts in case of failures (secs)" on the server connection is set to 60 seconds by default and connection attempt will be retried at the following time:

First startup at 1st second
Second startup at 2nd second
Third startup at 4th second
Fourth startup at 8th second
Fifth startup at 16th second
Sixth startup at 30th second
Seventh startup at 60th second

After the seventh startup, the server connection pool will be suspended and no longer available.

ALL

In order to make the server connection can reconnect to the gateway host infinitely to connect to the SAP gateway host upon reconnection, "Maximum time between two startup attempts in case of failures (secs)"  on the server connection can be set to the value of -1.

"Maximum time between two startup attempts in case of failures (secs)"  property can be found on server connection by following below steps:

1. Click on "Server Connection Configuration" tab on SAP Connection resource.

2. Select "Enabled" checkbox.

3. Click on "Show/Hide Advanced Options" and set the value of "Maximum time between two startup attempts in case of failures (secs)" to -1.

How to set the reconnect attempts infinitely on the server connection

BW SAP Plug-in, Server Connection Reconnect