The Iowa DOT Base Stations went through an update this winter 2018/2019.
They are now working again via the Trimble Base Station List for Differential Correction/Post Processing.
After you Update the Base List, the connections to Iowa DOT Base Station Server will be re-established.
In GPS Pathfinder Office click “Update List”
In Trimble Positions for ArcMap click “Update List”
If you have any questions about this please contact us at [email protected]