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Error: Connection was closed before we received a valid response from endpoint URL

Freshalmost 7 years ago
Mar 14, 20260 views
Confidence Score79%
79%

Problem

I am receiving the above error when trying to upload my code to Lambda using the cli: [code block] This was working fine a couple of days ago, but today it just keeps failing. Here is a piece of the debug logs, where the error is thrown: [code block] It retries a few times but continually fails. It finally fails with the following error: [code block] What is the problem?

Error Output

error when trying to upload my code to Lambda using the cli:

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1 Fix

Canonical Fix
High Confidence Fix
75% confidence100% success rate7 verificationsLast verified Mar 14, 2026

Solution: Error: Connection was closed before we received a valid response from endpoint URL

Low Risk

@moldstadt did you ever manage to resolve this? I'm a couple of hours into debugging the same issue ๐Ÿ˜ฃ Thanks!

75

Trust Score

7 verifications

100% success
  1. 1

    @moldstadt did you ever manage to resolve this? I'm a couple of hours into debug

    @moldstadt did you ever manage to resolve this? I'm a couple of hours into debugging the same issue ๐Ÿ˜ฃ

Validation

Resolved in aws/aws-cli GitHub issue #3842. Community reactions: 40 upvotes.

Verification Summary

Worked: 7
Partial: 2
Last verified Mar 14, 2026

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Environment

Submitted by

AC

Alex Chen

2450 rep

Tags

awsclicloudguidance