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Back to resultsCommand previewVerified 2026-07-23

Show only failed network system calls from a curl request

Build a paste-ready command, then review its compatibility and effects before running it.

Fill parameters

URLrequired

strace -f -e trace=%network -e status=failed curl <url>

Complete required fields to copy the generated command.

cautionnetwork

Compatibility

Recent strace

The status=failed filter requires a strace release that supports syscall return-status filtering.

Runs curl

This performs the supplied curl request under strace; review the URL before copying.

Operational knowledgereview due 2027-01-19

Requirements

stracestrace must be installed and available on PATH.
Network accessThe target must be reachable from the current environment.

Version support

strace Current supported releasesVerified for linux using posix, bash, zsh syntax; consult compatibility notes for platform-specific differences.

Expected signals

connect(5, {sa_family=AF_INET6, sin6_port=htons(53), inet_pton(AF_INET6, "2001:db8::53", &sin6_addr)}, 28) = -1 ENETUNREACH (Network is unreachable)Representative successful output; values vary with the selected target and system state.

Known errors

strace: command not foundstrace is missing or is not available on PATH.

Verifystrace -f -e trace=%network -e status=failed curl {{url}}Re-run the corresponding read-only inspection and confirm the intended state.Rollback noteNo universal automatic rollback is available. Capture the current state and use the tool-specific recovery procedure before applying changes.

Command breakdown

01strace

Command

Runs the strace stage of this one-liner.

02-f

Option

Follows child processes and threads created by the traced process.

03-e

Option

Applies the following syscall trace or return-status filter expression.

04trace=%network

Argument

Passes trace=%network to strace.

05-e

Option

Applies the following syscall trace or return-status filter expression.

06status=failed

Argument

Passes status=failed to strace.

07curl

Argument

Passes curl to strace.

08<url>

Parameter

A value supplied in the Fill parameters section.

Example input

strace -f -e trace=%network -e status=failed curl https://example.com

Example output

connect(5, {sa_family=AF_INET6, sin6_port=htons(53), inet_pton(AF_INET6, "2001:db8::53", &sin6_addr)}, 28) = -1 ENETUNREACH (Network is unreachable)
+++ exited with 6 +++

Illustrative output — exact values vary by system and data.

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Official sources

strace documentationofficial