# SSL error with the sample data module (Linux only)

**URL:** <https://discourse.slicer.org/t/ssl-error-with-the-sample-data-module-linux-only/8572>\
**Category:** Support\
**Created:** [September 25, 2019, 8:35pm UTC](https://discourse.slicer.org/t/ssl-error-with-the-sample-data-module-linux-only/8572 "2019-09-25T20:35:27Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![muratmaga](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/muratmaga/32/3622_2.png) [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Post date:** [September 25, 2019, 8:35pm UTC](https://discourse.slicer.org/t/ssl-error-with-the-sample-data-module-linux-only/8572/1 "2019-09-25T20:35:27Z")

</div>

I am getting a SSL certificate error for the sample data with distribute with SlicerMorph. This is the URL:  
[https://github.com/SlicerMorph/SampleData/blob/master/mouse\_skull\_LMs.zip?raw=true](https://github.com/SlicerMorph/SampleData/blob/master/mouse_skull_LMs.zip?raw=true)

I can get to this file from a web browser using the same in Linux box, but I when I use the sample data module I get this error messages with a [SSL:: CERTIFICATE\_VERIFY\_FAILED] and it only happens with our Linux boxes. Windows doesn’t seem to be affected.

```auto
Download failed: Traceback (most recent call last): 
File "/home/maga/Slicer/lib/Python/lib/python3.6/urllib/request.py", line 1318, in do_open encode_chunked=req.has_header('Transfer-encoding')) 
File "/home/maga/Slicer/lib/Python/lib/python3.6/http/client.py", line 1239, in request self._send_request(method, url, body, headers, encode_chunked) 
File "/home/maga/Slicer/lib/Python/lib/python3.6/http/client.py", line 1285, in _send_request self.endheaders(body, encode_chunked=encode_chunked) 
File "/home/maga/Slicer/lib/Python/lib/python3.6/http/client.py", line 1234, in endheaders self._send_output(message_body, encode_chunked=encode_chunked) 
File "/home/maga/Slicer/lib/Python/lib/python3.6/http/client.py", line 1026, in _send_output self.send(msg) 
File "/home/maga/Slicer/lib/Python/lib/python3.6/http/client.py", line 964, in send self.connect() 
File "/home/maga/Slicer/lib/Python/lib/python3.6/http/client.py", line 1400, in connect server_hostname=server_hostname) 
File "/home/maga/Slicer/lib/Python/lib/python3.6/ssl.py", line 407, in wrap_socket _context=self, _session=session) 
File "/home/maga/Slicer/lib/Python/lib/python3.6/ssl.py", line 817, in __init__ self.do_handshake() 
File "/home/maga/Slicer/lib/Python/lib/python3.6/ssl.py", line 1077, in do_handshake self._sslobj.do_handshake() 
File "/home/maga/Slicer/lib/Python/lib/python3.6/ssl.py", line 689, in do_handshake self._sslobj.do_handshake() ssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:847) 

During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/home/maga/Slicer/bin/../lib/Slicer-4.11/qt-scripted-modules/SampleData.py", line 812, in download
File urllib.request.urlretrieve(uri, filePath, self.reportHook) 
File "/home/maga/Slicer/lib/Python/lib/python3.6/urllib/request.py", line 248, in urlretrieve with contextlib.closing(urlopen(url, data)) as fp: 
File "/home/maga/Slicer/lib/Python/lib/python3.6/urllib/request.py", line 223, in urlopen return opener.open(url, data, timeout) 
File "/home/maga/Slicer/lib/Python/lib/python3.6/urllib/request.py", line 526, in open response = self._open(req, data) 
File "/home/maga/Slicer/lib/Python/lib/python3.6/urllib/request.py", line 544, in _open '_open', req) 
File "/home/maga/Slicer/lib/Python/lib/python3.6/urllib/request.py", line 504, in _call_chain result = func(*args) 
File "/home/maga/Slicer/lib/Python/lib/python3.6/urllib/request.py", line 1361, in https_open context=self._context, check_hostname=self._check_hostname) 
File "/home/maga/Slicer/lib/Python/lib/python3.6/urllib/request.py", line 1320, in do_open raise URLError(err) urllib.error.URLError: 

During handling of the above exception, another exception occurred: Traceback (most recent call last): 
File "/home/maga/Slicer/bin/../lib/Slicer-4.11/qt-scripted-modules/SampleData.py", line 609, in downloadFromSource filePath = self.downloadFileIntoCache(uri, fileName, checksum) F
ile "/home/maga/Slicer/bin/../lib/Slicer-4.11/qt-scripted-modules/SampleData.py", line 576, in downloadFileIntoCache return self.downloadFile(uri, destFolderPath, name, checksum) 
File "/home/maga/Slicer/bin/../lib/Slicer-4.11/qt-scripted-modules/SampleData.py", line 816, in downloadFile raise ValueError(f"Failed to download {uri} to {filePath}") ValueError: Failed to download https://github.com/SlicerMorph/SampleData/blob/master/mouse_skull_LMs.zip?raw=true to /home/maga/SlicerTemp/RemoteIO/mouse_skull_LMs.zip 

During handling of the above exception, another exception occurred: Traceback (most recent call last): 
File "/home/maga/Slicer/lib/Python/lib/python3.6/urllib/request.py", line 1318, in do_open encode_chunked=req.has_header('Transfer-encoding')) 
File "/home/maga/Slicer/lib/Python/lib/python3.6/http/client.py", line 1239, in request self._send_request(method, url, body, headers, encode_chunked) 
File "/home/maga/Slicer/lib/Python/lib/python3.6/http/client.py", line 1285, in _send_request self.endheaders(body, encode_chunked=encode_chunked) 
File "/home/maga/Slicer/lib/Python/lib/python3.6/http/client.py", line 1234, in endheaders self._send_output(message_body, encode_chunked=encode_chunked) File "/home/maga/Slicer/lib/Python/lib/python3.6/http/client.py", line 1026, in _send_output self.send(msg) File "/home/maga/Slicer/lib/Python/lib/python3.6/http/client.py", line 964, in send self.connect() 
File "/home/maga/Slicer/lib/Python/lib/python3.6/http/client.py", line 1400, in connect server_hostname=server_hostname) 
File "/home/maga/Slicer/lib/Python/lib/python3.6/ssl.py", line 407, in wrap_socket _context=self, _session=session) 
File "/home/maga/Slicer/lib/Python/lib/python3.6/ssl.py", line 817, in __init__ self.do_handshake() 
File "/home/maga/Slicer/lib/Python/lib/python3.6/ssl.py", line 1077, in do_handshake self._sslobj.do_handshake() 
File "/home/maga/Slicer/lib/Python/lib/python3.6/ssl.py", line 689, in do_handshake self._sslobj.do_handshake() ssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:847) 

During handling of the above exception, another exception occurred: Traceback (most recent call last): 
File "/home/maga/Slicer/bin/../lib/Slicer-4.11/qt-scripted-modules/SampleData.py", line 812, in downloadFile urllib.request.urlretrieve(uri, filePath, self.reportHook) 
File "/home/maga/Slicer/lib/Python/lib/python3.6/urllib/request.py", line 248, in urlretrieve with contextlib.closing(urlopen(url, data)) as fp: 
File "/home/maga/Slicer/lib/Python/lib/python3.6/urllib/request.py", line 223, in urlopen return opener.open(url, data, timeout) 
File "/home/maga/Slicer/lib/Python/lib/python3.6/urllib/request.py", line 526, in open response = self._open(req, data) 
File "/home/maga/Slicer/lib/Python/lib/python3.6/urllib/request.py", line 544, in _open '_open', req) 
File "/home/maga/Slicer/lib/Python/lib/python3.6/urllib/request.py", line 504, in _call_chain result = func(*args) 
File "/home/maga/Slicer/lib/Python/lib/python3.6/urllib/request.py", line 1361, in https_open context=self._context, check_hostname=self._check_hostname) 
File "/home/maga/Slicer/lib/Python/lib/python3.6/urllib/request.py", line 1320, in do_open raise URLError(err) urllib.error.URLError: 

During handling of the above exception, another exception occurred: Traceback (most recent call last): 
File "/home/maga/Slicer/bin/../lib/Slicer-4.11/qt-scripted-modules/SampleData.py", line 355, in b.connect('clicked()', lambda s=source: logic.downloadFromSource(s)) 
File "/home/maga/Slicer/bin/../lib/Slicer-4.11/qt-scripted-modules/SampleData.py", line 614, in downloadFromSource filePath = self.downloadFileIntoCache(uri, fileName, checksum) 
File "/home/maga/Slicer/bin/../lib/Slicer-4.11/qt-scripted-modules/SampleData.py", line 576, in downloadFileIntoCache return self.downloadFile(uri, destFolderPath, name, checksum) 
File "/home/maga/Slicer/bin/../lib/Slicer-4.11/qt-scripted-modules/SampleData.py", line 816, in downloadFile raise ValueError(f"Failed to download {uri} to {filePath}") ValueError: Failed to download https://github.com/SlicerMorph/SampleData/blob/master/mouse_skull_LMs.zip?raw=true to /home/maga/SlicerTemp/RemoteIO/mouse_skull_LMs.zip

```

---

<div class="post-metadata">

**Author:** ![pieper](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pieper/32/8_2.png) [@pieper](https://discourse.slicer.org/u/pieper)\
**Post date:** [September 25, 2019, 9:32pm UTC](https://discourse.slicer.org/t/ssl-error-with-the-sample-data-module-linux-only/8572/2 "2019-09-25T21:32:46Z")

</div>

Hmm, perhaps we need to update our version of `certifi` or other certificates. Was this with 4.10.2 or the nightly or both?

---

<div class="post-metadata">

**Author:** ![muratmaga](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/muratmaga/32/3622_2.png) [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Post date:** [October 15, 2019, 7:49pm UTC](https://discourse.slicer.org/t/ssl-error-with-the-sample-data-module-linux-only/8572/3 "2019-10-15T19:49:42Z")

</div>

It was with nightly, we really have no use for 4.10.2 anymore (with the all the changes to markups). But I can download and try if it is going to help.

---

<div class="post-metadata">

**Author:** ![jcfr](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jcfr/32/17825_2.png) [@jcfr](https://discourse.slicer.org/u/jcfr)\
**Post date:** [October 15, 2019, 9:29pm UTC](https://discourse.slicer.org/t/ssl-error-with-the-sample-data-module-linux-only/8572/4 "2019-10-15T21:29:18Z")

</div>

Could you also try the execute the following statements and report back ?

- (1) from Slicer python interactor

- (2) from python interpreter shipped with Slicer (found in `/path/to/install/bin/PythonSlicer`

python code to execute:

```python
import urllib.request
urllib.request.urlretrieve("https://github.com/SlicerMorph/SampleData/blob/master/mouse_skull_LMs.zip?raw=true", "/tmp//mouse_skull_LMs.zip")

```

---

<div class="post-metadata">

**Author:** ![muratmaga](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/muratmaga/32/3622_2.png) [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Post date:** [October 16, 2019, 3:28am UTC](https://discourse.slicer.org/t/ssl-error-with-the-sample-data-module-linux-only/8572/5 "2019-10-16T03:28:27Z")

</div>

> [@jcfr](#):
>
> ```auto
> import urllib.request
> urllib.request.urlretrieve("https://github.com/SlicerMorph/SampleData/blob/master/mouse_skull_LMs.zip?raw=true", "/tmp//mouse_skull_LMs.zip")
> 
> ```

from **#1**

```python
    >>> import urllib.request
    >>> urllib.request.urlretrieve("https://github.com/SlicerMorph/SampleData/blob/master/mouse_skull_LMs.zip?raw=true", "/tmp//mouse_skull_LMs.zip")
    Traceback (most recent call last):
      File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/urllib/request.py", line 1318, in do_open
    encode_chunked=req.has_header('Transfer-encoding'))
      File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/http/client.py", line 1239, in request
    self._send_request(method, url, body, headers, encode_chunked)
      File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/http/client.py", line 1285, in _send_request
    self.endheaders(body, encode_chunked=encode_chunked)
      File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/http/client.py", line 1234, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
      File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/http/client.py", line 1026, in _send_output
    self.send(msg)
      File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/http/client.py", line 964, in send
    self.connect()
      File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/http/client.py", line 1400, in connect
    server_hostname=server_hostname)
      File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/ssl.py", line 407, in wrap_socket
    _context=self, _session=session)
      File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/ssl.py", line 817, in __init__
    self.do_handshake()
      File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/ssl.py", line 1077, in do_handshake
    self._sslobj.do_handshake()
      File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/ssl.py", line 689, in do_handshake
    self._sslobj.do_handshake()
    ssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:847)

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File "<console>", line 1, in <module>
      File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/urllib/request.py", line 248, in urlretrieve
    with contextlib.closing(urlopen(url, data)) as fp:
      File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/urllib/request.py", line 223, in urlopen
    return opener.open(url, data, timeout)
      File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/urllib/request.py", line 526, in open
    response = self._open(req, data)
      File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/urllib/request.py", line 544, in _open
    '_open', req)
      File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/urllib/request.py", line 504, in _call_chain
    result = func(*args)
      File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/urllib/request.py", line 1361, in https_open
    context=self._context, check_hostname=self._check_hostname)
      File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/urllib/request.py", line 1320, in do_open
    raise URLError(err)
    urllib.error.URLError: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:847)>

```

from **#2**

```python
[maga@magalab-head bin]$ PythonSlicer 
Python 3.6.7 (default, Sep 25 2019, 03:07:17) 
[GCC 5.3.1 20160406 (Red Hat 5.3.1-6)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import urllib.request
urllib.request.urlretrieve("https://github.com/SlicerMorph/SampleData/blob/master/mouse_skull_LMs.zip?raw=true", "/tmp//mouse_skull_LMs.zip")

>>> Traceback (most recent call last):
  File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/urllib/request.py", line 1318, in do_open
    encode_chunked=req.has_header('Transfer-encoding'))
  File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/http/client.py", line 1239, in request
    self._send_request(method, url, body, headers, encode_chunked)
  File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/http/client.py", line 1285, in _send_request
    self.endheaders(body, encode_chunked=encode_chunked)
  File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/http/client.py", line 1234, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/http/client.py", line 1026, in _send_output
    self.send(msg)
  File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/http/client.py", line 964, in send
    self.connect()
  File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/http/client.py", line 1400, in connect
    server_hostname=server_hostname)
  File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/ssl.py", line 407, in wrap_socket
    _context=self, _session=session)
  File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/ssl.py", line 817, in __init__
    self.do_handshake()
  File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/ssl.py", line 1077, in do_handshake
    self._sslobj.do_handshake()
  File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/ssl.py", line 689, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:847)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/urllib/request.py", line 248, in urlretrieve
    with contextlib.closing(urlopen(url, data)) as fp:
  File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/urllib/request.py", line 223, in urlopen
    return opener.open(url, data, timeout)
  File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/urllib/request.py", line 526, in open
    response = self._open(req, data)
  File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/urllib/request.py", line 544, in _open
    '_open', req)
  File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/urllib/request.py", line 504, in _call_chain
    result = func(*args)
  File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/urllib/request.py", line 1361, in https_open
    context=self._context, check_hostname=self._check_hostname)
  File "/usr/local/Slicer-4.11.0-2019-09-24-linux-amd64/lib/Python/lib/python3.6/urllib/request.py", line 1320, in do_open
    raise URLError(err)
urllib.error.URLError: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:847)>

```