java post调用https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=

以下报错：

org.apache.http.conn.HttpHostConnectException: Connect to api.weixin.qq.com:443 [api.weixin.qq.com/116.128.170.42, api.weixin.qq.com/116.128.184.169, api.weixin.qq.com/112.65.193.153] failed: Connection timed out: connect

at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:158)

at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:353)

at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:380)

使用postman调用结果正常。

麻烦问下，什么原因导致。