Problem to connect to PostGIS/PostGres Database

I want to connect to an external PostGIS database in OpenCitiesMap, but I always get the following error message: authentication method not supported (received: 10).
By the way, with ArcGIS I can connect to the PostGIS database without any problems.
I use OpenCities Map Advanced Connect Edition Update 7 (10.07.01.09)
How can I solve the problem?