# SSLv3\_server\_method

**URL:** <https://discourse.mitmproxy.org/t/sslv3-server-method/246>\
**Category:** help\
**Created:** [December 3, 2016, 12:11pm UTC](https://discourse.mitmproxy.org/t/sslv3-server-method/246 "2016-12-03T12:11:04Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ievgenii\_2pv](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.mitmproxy.org/ievgenii_2pv/32/76_2.png) [@ievgenii\_2pv](https://discourse.mitmproxy.org/u/ievgenii_2pv)\
**Post date:** [December 3, 2016, 12:11pm UTC](https://discourse.mitmproxy.org/t/sslv3-server-method/246/1 "2016-12-03T12:11:04Z")

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Hello,  
I’m trying to run mitmproxy and getting the following error:

> ```
> Traceback (most recent call last):
> File "/usr/local/bin/mitmproxy", line 7, in <module>
> from mitmproxy.main import mitmproxy
> File "/usr/local/lib/python2.7/dist-packages/mitmproxy/main.py", line 9, in <module>
> from mitmproxy import cmdline
> File "/usr/local/lib/python2.7/dist-packages/mitmproxy/cmdline.py", line 7, in <module>
> from mitmproxy import flowfilter
> File "/usr/local/lib/python2.7/dist-packages/mitmproxy/flowfilter.py", line 41, in <module>
> from mitmproxy.models.http import HTTPFlow
> File "/usr/local/lib/python2.7/dist-packages/mitmproxy/models/ __init__.py", line 4, in <module>
> from .connections import ClientConnection, ServerConnection
> File "/usr/local/lib/python2.7/dist-packages/mitmproxy/models/connections.py", line 10, in <module>
> from netlib import certutils
> File "/usr/local/lib/python2.7/dist-packages/netlib/certutils.py", line 13, in <module>
> import OpenSSL
> File "/usr/local/lib/python2.7/dist-packages/OpenSSL/ __init__.py", line 8, in <module>
> from OpenSSL import rand, crypto, SSL
> File "/usr/local/lib/python2.7/dist-packages/OpenSSL/rand.py", line 12, in <module>
> from OpenSSL._util import (
> File "/usr/local/lib/python2.7/dist-packages/OpenSSL/_util.py", line 6, in <module>
> from cryptography.hazmat.bindings.openssl.binding import Binding
> File "/usr/local/lib/python2.7/dist-packages/cryptography/hazmat/bindings/openssl/binding.py", line 14, in <module>
> from cryptography.hazmat.bindings._openssl import ffi, lib
> ImportError: /usr/local/lib/python2.7/dist-packages/cryptography/hazmat/bindings/_openssl.so: undefined symbol: SSLv3_server_method**
> 
> ```

How can I fix it?

---

<div class="post-metadata">

**Author:** ![mhils](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.mitmproxy.org/mhils/32/7_2.png) [@mhils](https://discourse.mitmproxy.org/u/mhils)\
**Post date:** [December 8, 2016, 2:29pm UTC](https://discourse.mitmproxy.org/t/sslv3-server-method/246/2 "2016-12-08T14:29:33Z")

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This is caused by the cryptography Python module, which fails on your system when we just call `import OpenSSL`. You can probably fix your problem by upgrading/reinstalling cryptography and/or OpenSSL on your system.