Question:

Can you provide a list of sites and IP addresses that OpenRoads ConceptStation needs to access?

Answer:

https://connect-contextservices.bentley.com/ - for GeoCoordination Services

https://api.mapbox.com - for Map control

https://a.tiles.mapbox.com - for Map control

https://b.tiles.mapbox.com - for Map control

ftp://rockyftp.cr.usgs.gov - for USGS files

https://prd-tnm.s3.amazonaws.com  - for USGS files

http://overpass-api.de - for OSM

Also, please see this article for the connection requirements for CONNECT: http://communities.bentley.com/products/licensing/w/licensing__wiki/6857.connecting-to-the-bentley-servers-through-firewalls-and-proxy-servers-faq