As from the 18 October 2016 (NM20.5), NM B2B URLs syntax will have to be changed.
For LARA V2.2 configuration, you should adapt the clients settings configuration file clientSettings.gsdk, while for V3.0, you should adapt server settings configuration file serverSettings.gsdk.
Old: OPS.B2B.ENDPOINT_URL “https://www.nm.eurocontrol.int:16443/B2B_OPS/gateway/spec/19.5.0”
New: OPS.B2B.ENDPOINT_URL “https://www.b2b.nm.eurocontrol.int/B2B_OPS/gateway/spec/20.0.0”
Old: PREOPS.B2B.ENDPOINT_URL “https://www.nm.eurocontrol.int:16443/B2B_PREOPS/gateway/spec/19.5.0”
New: PREOPS.B2B.ENDPOINT_URL “https://www.b2b.preops.nm.eurocontrol.int/B2B_PREOPS/gateway/spec/20.0.0”
These new URLs are already been actived.