maven项目打包时报错，Service Unavaliable

maven项目打包时报错，Service Unavaliable是网络不通？
Could not transfer artifact ssde:sx-core:jar:4.0.3 from/to central (http://repo.maven.apache.org/maven2): Failed to transfer file: http://repo.maven.apache.org/maven2/sx-core/4.0.3/ux-core-4.0.3.jar. Return code is: 503, ReasonPhrase: Service Unavaliable.

单独打开这个jar的路径看看是否访问正常

更换仓库地址，默认的地址是外网的，访问速度慢。