No output when connecting to a firewall using urllib3>=2.6.2

[01xR4in]

Hi,
I ran into a connection issue on a remote appliance after installing the module in a fresh environment/ python-SNS-API install.

I didn't encounter any problem when I was directly connected to a local firewall.

I remember a time when I had some problems on a remote appliance while executing some commands, but can't seem to reproduce this case again, so let's focus on the connection problem.

Current environment

OS : Debian 13 VM / Windows 11 25H2
Python version : 3.13.5 /
Python dependencies version :

Package                   Version
------------------------- ---------
certifi                   2026.2.25
charset-normalizer        3.4.7
colorlog                  6.10.1
defusedxml                0.7.1
idna                      3.11
packaging                 26.0
pygments                  2.20.0
pysocks                   1.7.1
requests                  2.33.1
requests-toolbelt         1.0.0
stormshield-sns-sslclient 1.1.1
urllib3                   2.6.3

Steps to reproduce

1. Create a venv / use a fresh environment w/o any installed packages

python3 -m venv .venv
uv venv

2. Activate your shell with the venv

source .venv/bin/activate 
.\.venv\Scripts\activate

3. Try to connect to an appliance using this sample script :

from stormshield.sns.sslclient import SSLClient # Import the Lib

# Variable initialisation
host = "X.X.X.X"
port = "443"
user = "admin"
password = "admin"
logged = False

# Basic logic handling
try:
    client = SSLClient(
        host=host, port=port, user=user, password=password,
        sslverifyhost=False, sslverifypeer=False, timeout=10
    )
    print(f"Successful login to {host}:{port}")
    logged = True
except Exception as err:
    print(f"Error while connecting to {host}:{port} - {type(err)} {err}")

if logged:
    try:
        client.disconnect()
        print(f"Successfully disconnected to {host}:{port}")
    except Exception as err:
        print(f"Error while disconnecting from {host}:{port} - {type(err)} {err}")

Steps to fix issue

Pre-install / pin urllib3 at the version 2.6.1, otherwise it breaks.

urllib3 is a direct dependency of requests, which is why it gets installed and causes me some issues, is also used in the codebase but isn't declared as a dependency in ./setup.py

I didn't take the time to look at the changelog between urllib3==2.6.1 and urllib3==2.6.2, nor the at implementation in the module yet, will do so when I have some time available.

[01xR4in]

BTW, I noted that the project dependencies are stored in ./setup.py, while other projects define these setup steps inside a ./pyproject.toml file, should we migrate this part of the module to this file layout ?

[remip2]

Hi, what is your exact error ?

I can't reproduce with my env, python 3.10.12 and:

Package                   Version
------------------------- ---------
certifi                   2026.2.25
charset-normalizer        3.4.7
colorlog                  6.10.1
defusedxml                0.7.1
exceptiongroup            1.3.1
idna                      3.11
iniconfig                 2.3.0
packaging                 26.1
pip                       24.2
pluggy                    1.6.0
Pygments                  2.20.0
PySocks                   1.7.1
pytest                    9.0.3
requests                  2.33.1
requests-toolbelt         1.0.0
setuptools                68.2.0
stormshield.sns.sslclient 1.1.1
tomli                     2.4.1
typing_extensions         4.15.0
urllib3                   2.6.3
wheel                     0.41.2

[01xR4in]

Heya,

I forgot to keep this issue updated 😅

I think it comes from a change in the requests module, handling decompression from the server. Maybe the firewall I'm connecting to is configured in a way that trigger this, as I'm having no problems on a local one.

I'm not able to debug this this week as I'm off, but will keep it updated with my finds