This is only for FG_1.2(for minecraft 1.7.10). Minecraft mod development framework used by Forge and FML for the gradle build system
It's can't be disabled by your custom system property and ignores correct maven repository URL. I think cause in this logic (may be add NOT to second condition?): https://github.com/anatawa12/ForgeGradle-1.2/blob/fa4b883e833deda50b1047b934c03518ec0649da/src/main/java/net/minecraftforge/gradle/common/BasePlugin.java#L215-L216C30
This issue appears to be discussing a feature request or bug report related to the repository. Based on the content, it seems to be resolved. The issue was opened by MJaroslav and has received 1 comments.