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diff --git a/paramiko/transport.py b/paramiko/transport.py
index f72eebaf..ec7a1445 100644
--- a/paramiko/transport.py
+++ b/paramiko/transport.py
@@ -110,6 +110,8 @@ from paramiko.ssh_exception import (
from paramiko.util import retry_on_signal, ClosingContextManager, clamp_value
+SERVER_DISABLED_BY_GENTOO = True
+
# for thread cleanup
_active_threads = []
@@ -633,6 +635,8 @@ class Transport(threading.Thread, ClosingContextManager):
`.SSHException` -- if negotiation fails (and no ``event`` was
passed in)
"""
+ if SERVER_DISABLED_BY_GENTOO:
+ raise Exception("Disabled by Gentoo for security reasons. Enable with 'server' USE flag")
if server is None:
server = ServerInterface()
self.server_mode = True
diff --git a/tests/conftest.py b/tests/conftest.py
index 2b509c5c..bb23ac74 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -4,7 +4,7 @@ import shutil
import threading
import pytest
-from paramiko import RSAKey, SFTPServer, SFTP, Transport
+from paramiko import RSAKey, SFTPServer, SFTP, Transport, transport
from .loop import LoopSocket
from .stub_sftp import StubServer, StubSFTPServer
@@ -15,6 +15,10 @@ from .util import _support
# 'nicer'.
+# We need the server component for testing
+transport.SERVER_DISABLED_BY_GENTOO = False
+
+
# Perform logging by default; pytest will capture and thus hide it normally,
# presenting it on error/failure. (But also allow turning it off when doing
# very pinpoint debugging - e.g. using breakpoints, so you don't want output
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