proxy.golang.org: wsarecv: An existing connection was forcibly closed by the remote host from ZSCALER, INC ip.

[nitin455]

Go version

go version go1.24.0 windows/amd64

Output of go env in your module/workspace:

set AR=ar
set CC=gcc
set CGO_CFLAGS=-O2 -g
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-O2 -g
set CGO_ENABLED=0
set CGO_FFLAGS=-O2 -g
set CGO_LDFLAGS=-O2 -g
set CXX=g++
set GCCGO=gccgo
set GO111MODULE=
set GOAMD64=v1
set GOARCH=amd64
set GOAUTH=netrc
set GOBIN=
set GOCACHE=C:\Users\xxx\AppData\Local\go-build
set GOCACHEPROG=
set GODEBUG=
set GOENV=C:\Users\xxx\AppData\Roaming\go\env
set GOEXE=.exe
set GOEXPERIMENT=
set GOFIPS140=off
set GOFLAGS=
set GOGCCFLAGS=-m64 -fno-caret-diagnostics -Qunused-arguments -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=C:\Users\xxx\AppData\Local\Temp\go-build994176254=/tmp/go-build -gno-record-gcc-switches
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOINSECURE=
set GOMOD=C:\Users\xxx\go\src\xxx\go.mod
set GOMODCACHE=C:\Users\xxx\go\pkg\mod
set GONOPROXY=gitlab.com/xxx/*
set GONOSUMDB=gitlab.com/xxx/*
set GOOS=windows
set GOPATH=C:\Users\xxx\go
set GOPRIVATE=gitlab.com/xxx/*
set GOPROXY=https://proxy.golang.org,direct
set GOROOT=C:\Program Files\Go
set GOSUMDB=sum.golang.org
set GOTELEMETRY=local
set GOTELEMETRYDIR=C:\Users\xxx\AppData\Roaming\go\telemetry
set GOTMPDIR=
set GOTOOLCHAIN=auto
set GOTOOLDIR=C:\Program Files\Go\pkg\tool\windows_amd64
set GOVCS=
set GOVERSION=go1.24.0
set GOWORK=
set PKG_CONFIG=pkg-config

What did you do?

When I am trying to run command go mod tidy or go build, i am getting below error.

PS C:\Users\xxx\go\src\xxx> go mod tidy
go: downloading golang.org/x/sys v0.18.0
go: downloading github.com/google/pprof v0.0.0-20230309165930-d61513b1440d
go: gitlab.com/xxx/xxx imports
        gopkg.in/DataDog/dd-trace-go.v1/ddtrace/tracer imports
        golang.org/x/sys/windows: golang.org/x/sys@v0.18.0: read "https://proxy.golang.org/golang.org/x/sys/@v/v0.18.0.zip": read tcp 192.168.x.x:xxxx->142.250.196.177:443: wsarecv: An existing connection was forcibly closed by the remote host.
go: gitlab.com/xxx/xxx  imports
        gopkg.in/DataDog/dd-trace-go.v1/profiler imports
        github.com/google/pprof/profile: github.com/google/pprof@v0.0.0-20230309165930-d61513b1440d: read "https://proxy.golang.org/github.com/google/pprof/@v/v0.0.0-20230309165930-d61513b1440d.zip": read tcp 192.168.x.x:xxxx->142.250.196.177:443: wsarecv: An existing connection was forcibly closed by the remote host.
go: gitlab.com/xxx/xxx imports
        gopkg.in/DataDog/dd-trace-go.v1/ddtrace/tracer imports
        gopkg.in/DataDog/dd-trace-go.v1/internal/osinfo imports
        golang.org/x/sys/windows/registry: golang.org/x/sys@v0.18.0: read "https://proxy.golang.org/golang.org/x/sys/@v/v0.18.0.zip": read tcp 192.168.x.x:xxxx->142.250.196.177:443: wsarecv: An existing connection was forcibly closed by the remote host.
go: gitlab.com/xxx/xxx/internal/model/account imports
        github.com/go-playground/validator/v10 imports
        golang.org/x/crypto/sha3 imports
        golang.org/x/sys/cpu: golang.org/x/sys@v0.18.0: read "https://proxy.golang.org/golang.org/x/sys/@v/v0.18.0.zip": read tcp 192.168.x.x:xxxx->142.250.196.177:443: wsarecv: An existing connection was forcibly closed by the remote host.       
go: gitlab.com/xxx/xxx/internal/setup imports
        github.com/labstack/gommon/log imports
        github.com/mattn/go-isatty imports
        golang.org/x/sys/unix: golang.org/x/sys@v0.18.0: read "https://proxy.golang.org/golang.org/x/sys/@v/v0.18.0.zip": read tcp 192.168.x.x:xxxx->142.250.196.177:443: wsarecv: An existing connection was forcibly closed by the remote host.

What did you see happen?

I am unable to run or build my application on my system. It always give connection closed error.

PS C:\Users\xxx\go\src\xxx> go mod tidy
go: downloading golang.org/x/sys v0.18.0
go: downloading github.com/google/pprof v0.0.0-20230309165930-d61513b1440d
go: gitlab.com/xxx/xxx imports
        gopkg.in/DataDog/dd-trace-go.v1/ddtrace/tracer imports
        golang.org/x/sys/windows: golang.org/x/sys@v0.18.0: read "https://proxy.golang.org/golang.org/x/sys/@v/v0.18.0.zip": read tcp 192.168.x.x:xxxx->142.250.196.177:443: wsarecv: An existing connection was forcibly closed by the remote host.
go: gitlab.com/xxx/xxx  imports
        gopkg.in/DataDog/dd-trace-go.v1/profiler imports
        github.com/google/pprof/profile: github.com/google/pprof@v0.0.0-20230309165930-d61513b1440d: read "https://proxy.golang.org/github.com/google/pprof/@v/v0.0.0-20230309165930-d61513b1440d.zip": read tcp 192.168.x.x:xxxx->142.250.196.177:443: wsarecv: An existing connection was forcibly closed by the remote host.
go: gitlab.com/xxx/xxx imports
        gopkg.in/DataDog/dd-trace-go.v1/ddtrace/tracer imports
        gopkg.in/DataDog/dd-trace-go.v1/internal/osinfo imports
        golang.org/x/sys/windows/registry: golang.org/x/sys@v0.18.0: read "https://proxy.golang.org/golang.org/x/sys/@v/v0.18.0.zip": read tcp 192.168.x.x:xxxx->142.250.196.177:443: wsarecv: An existing connection was forcibly closed by the remote host.
go: gitlab.com/xxx/xxx/internal/model/account imports
        github.com/go-playground/validator/v10 imports
        golang.org/x/crypto/sha3 imports
        golang.org/x/sys/cpu: golang.org/x/sys@v0.18.0: read "https://proxy.golang.org/golang.org/x/sys/@v/v0.18.0.zip": read tcp 192.168.x.x:xxxx->142.250.196.177:443: wsarecv: An existing connection was forcibly closed by the remote host.       
go: gitlab.com/xxx/xxx/internal/setup imports
        github.com/labstack/gommon/log imports
        github.com/mattn/go-isatty imports
        golang.org/x/sys/unix: golang.org/x/sys@v0.18.0: read "https://proxy.golang.org/golang.org/x/sys/@v/v0.18.0.zip": read tcp 192.168.x.x:xxxx->142.250.196.177:443: wsarecv: An existing connection was forcibly closed by the remote host.

What did you expect to see?

I am expecting that my application should run normally without errors.

[Jorropo]

What is your public IP ? (for the network address, so 24 first bits)

[nitin455]

What is your public IP ? (for the network address, so 24 first bits)

136.226.255

[Jorropo]

Thx, here are the networks https://bgpview.io/ip/136.226.255.0.

[Jorropo]

For completeness can you try go mod tidy with ENV GOPROXY set to direct ?
It might work, then it's very likely an issue with the proxy altho it should still be fixed even if GOPROXY=direct works.

[seankhliao]

if zscaler is closing your connections, please talk to your network admin.

[nitin455]

There was ZScaler in between and it was making problem. Issue got resolved after disabling ZScaler.

Thanks everyone for your valuable inputs.