使用go mod init时,报以下错误,请问如何解决网络问题?
[root@localhost fabric]# go mod init
go: creating new go.mod: module github.com/hyperledger/fabric
go: copying requirements from Gopkg.lock
go: converting Gopkg.lock: stat golang.org/x/sys@af653ce8b74f808d092db8ca9741fbb63d2a469d: unrecognized import path "golang.org/x/sys": https fetch: Get "https://golang.org/x/sys?go-get=1": dial tcp 216.239.37.1:443: connect: connection refused
go: converting Gopkg.lock: stat golang.org/x/sync@1d60e4601c6fd243af51cc01ddf169918a5407ca: unrecognized import path "golang.org/x/sync": https fetch: Get "https://golang.org/x/sync?go-get=1": dial tcp 216.239.37.1:443: connect: connection refused
go: converting Gopkg.lock: stat golang.org/x/net@f5e5bdd778241bfefa8627f7124c39cd6ad8d74f: unrecognized import path "golang.org/x/net": https fetch: Get "https://golang.org/x/net?go-get=1": dial tcp 216.239.37.1:443: connect: connection refused
go: converting Gopkg.lock: stat google.golang.org/grpc@v1.15.0: unrecognized import path "google.golang.org/grpc": https fetch: Get "https://google.golang.org/grpc?go-get=1": dial tcp 216.239.37.1:443: connect: connection refused
go: converting Gopkg.lock: stat golang.org/x/lint@c67002cb31c3a748b7688c27f20d8358b4193582: unrecognized import path "golang.org/x/lint": https fetch: Get "https://golang.org/x/lint?go-get=1": dial tcp 216.239.37.1:443: connect: connection refused
go: converting Gopkg.lock: stat golang.org/x/tools@f60e5f99f0816fc2d9ecb338008ea420248d2943: unrecognized import path "golang.org/x/tools": https fetch: Get "https://golang.org/x/tools?go-get=1": dial tcp 216.239.37.1:443: connect: connection refused
go: converting Gopkg.lock: stat golang.org/x/text@v0.3.0: unrecognized import path "golang.org/x/text": https fetch: Get "https://golang.org/x/text?go-get=1": dial tcp 216.239.37.1:443: connect: connection refused
go: converting Gopkg.lock: stat golang.org/x/crypto@e3636079e1a4c1f337f212cc5cd2aca108f6c900: unrecognized import path "golang.org/x/crypto": https fetch: Get "https://golang.org/x/crypto?go-get=1": dial tcp 216.239.37.1:443: connect: connection refused