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fix: Resolving MutualTLSChannelError 'OpenSSL' module error on by adding pyopenssl dependency in pyproject.toml#4322

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fix: Resolving MutualTLSChannelError 'OpenSSL' module error on by adding pyopenssl dependency in pyproject.toml#4322
agrawalradhika-cell wants to merge 1 commit intogoogle:mainfrom
agrawalradhika-cell:update-req

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@agrawalradhika-cell agrawalradhika-cell commented Jan 30, 2026

fix: Resolving MutualTLSChannelError 'OpenSSL' module error on by adding pyopenssl dependency in pyproject.toml

  • Add 'pyopenssl' to project dependencies to fix MutualTLSChannelError encountered during mTLS channel configuration.

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Problem:
The ADK (Agent Development Kit) fails with a MutualTLSChannelError because the google-auth library cannot find the OpenSSL module during mTLS channel configuration.

Solution:
Dependency Hardening for (pyopenssl)

Testing Plan

Tested on colab with a test-branch fix and see that the module error doesn't persist after the fix. See colab for more details

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  • I have added or updated unit tests for my change.
  • [] All unit tests pass locally.

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Manual End-to-End (E2E) Tests:

  1. Create Custom AdkApp which overrides async_create_session to refresh credentials and call a GCS bucket-listing helper during session initialization.
  2. LlmAgent is initialized and deployed to Vertex AI as a Reasoning Engine with AGENT_IDENTITY enabled and specific
  3. Configure IAM Permissions to grant the Agent Identity mandatory IAM roles
  4. the async_create_session method is called on the remote application to verify that the agent is successfully able to use GCS.

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  • [] I have commented my code, particularly in hard-to-understand areas.
  • I have added tests that prove my fix is effective or that my feature works.
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  • I have manually tested my changes end-to-end.
  • [] Any dependent changes have been merged and published in downstream modules.

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@agrawalradhika-cell
fix: Resolving MutualTLSChannelError 'OpenSSL' module error on by add…
6a8cf69 
…ing pyopenssl dependency in pyproject.toml

- Add 'pyopenssl' to project dependencies to fix MutualTLSChannelError 
  encountered during mTLS channel configuration.
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gemini-code-assist bot commented Jan 30, 2026

Summary of Changes

Hello @agrawalradhika-cell, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves a critical MutualTLSChannelError that occurred during mTLS channel configuration within the ADK (Agent Development Kit). The issue stemmed from a missing pyopenssl dependency, which is implicitly required by the google-auth library. By explicitly adding pyopenssl to the project's dependencies, the necessary OpenSSL module is now guaranteed to be available, preventing application failures and ensuring secure communication.

Highlights

  • Dependency Management: Added pyopenssl with version >=25.3.0 to the project dependencies in pyproject.toml. This addition is crucial for resolving MutualTLSChannelError encountered during mTLS channel configuration.

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@adk-bot adk-bot added the core [Component] This issue is related to the core interface and implementation label Jan 30, 2026
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Code Review

This pull request correctly resolves a MutualTLSChannelError by adding pyopenssl as a dependency. My review includes a suggestion to add a version upper bound and a descriptive comment for this new dependency to improve maintainability and align with the existing format of other dependencies in pyproject.toml.

@ryanaiagent ryanaiagent self-assigned this Feb 2, 2026
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ryanaiagent commented Feb 3, 2026 •
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Hi @agrawalradhika-cell , closing this here as i see an approved CL.

@ryanaiagent ryanaiagent closed this Feb 3, 2026
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