diff --git a/ansible_mitogen/connection.py b/ansible_mitogen/connection.py
index b566b541..e017608e 100644
--- a/ansible_mitogen/connection.py
+++ b/ansible_mitogen/connection.py
@@ -31,6 +31,7 @@ from __future__ import unicode_literals
 
 import logging
 import os
+import pprint
 import random
 import stat
 import time
@@ -699,11 +700,16 @@ class Connection(ansible.plugins.connection.ConnectionBase):
         representing the target. If no connection exists yet, ContextService
         will establish it before returning it or throwing an error.
         """
-        dct = self.parent.call_service(
-            service_name='ansible_mitogen.services.ContextService',
-            method_name='get',
-            stack=mitogen.utils.cast(list(stack)),
-        )
+        try:
+            dct = self.parent.call_service(
+                service_name='ansible_mitogen.services.ContextService',
+                method_name='get',
+                stack=mitogen.utils.cast(list(stack)),
+            )
+        except mitogen.core.CallError:
+            LOG.warning('Connection failed; stack configuration was:\n%s',
+                        pprint.pformat(stack))
+            raise
 
         if dct['msg']:
             if dct['method_name'] in self.become_methods:
@@ -809,6 +815,10 @@ class Connection(ansible.plugins.connection.ConnectionBase):
             self.broker = None
             self.router = None
 
+    reset_compat_msg = (
+        'Mitogen only supports "reset_connection" on Ansible 2.5.6 or later'
+    )
+
     def reset(self):
         """
         Explicitly terminate the connection to the remote host. This discards
@@ -816,6 +826,13 @@ class Connection(ansible.plugins.connection.ConnectionBase):
         the 'disconnected' state, and informs ContextService the connection is
         bad somehow, and should be shut down and discarded.
         """
+        if self._play_context.remote_addr is None:
+            # <2.5.6 incorrectly populate PlayContext for reset_connection
+            # https://github.com/ansible/ansible/issues/27520
+            raise ansible.errors.AnsibleConnectionFailure(
+                self.reset_compat_msg
+            )
+
         self._connect()
         self._mitogen_reset(mode='reset')
 
diff --git a/tests/ansible/integration/connection/reset.yml b/tests/ansible/integration/connection/reset.yml
index 56e901b7..768cd2d5 100644
--- a/tests/ansible/integration/connection/reset.yml
+++ b/tests/ansible/integration/connection/reset.yml
@@ -6,8 +6,15 @@
 - name: integration/connection/reset.yml
   hosts: test-targets
   tasks:
-  - when: is_mitogen
-    block:
+    - meta: end_play
+      when: not is_mitogen
+
+    - debug: msg="reset.yml skipped on Ansible<2.5.6"
+      when: ansible_version.full < '2.5.6'
+
+    - meta: end_play
+      when: ansible_version.full < '2.5.6'
+
     - custom_python_detect_environment:
       register: out
 
diff --git a/tests/ansible/integration/connection_loader/paramiko_unblemished.yml b/tests/ansible/integration/connection_loader/paramiko_unblemished.yml
index a71af868..de8de4b0 100644
--- a/tests/ansible/integration/connection_loader/paramiko_unblemished.yml
+++ b/tests/ansible/integration/connection_loader/paramiko_unblemished.yml
@@ -1,6 +1,6 @@
 # Ensure paramiko connections aren't grabbed.
 
-- name: integration/connection_loader__paramiko_unblemished.yml
+- name: integration/connection_loader/paramiko_unblemished.yml
   hosts: test-targets
   any_errors_fatal: true
   tasks:
diff --git a/tests/ansible/integration/delegation/osa_delegate_to_self.yml b/tests/ansible/integration/delegation/osa_delegate_to_self.yml
index 0915bbb8..a9cd6c6e 100644
--- a/tests/ansible/integration/delegation/osa_delegate_to_self.yml
+++ b/tests/ansible/integration/delegation/osa_delegate_to_self.yml
@@ -22,6 +22,7 @@
                     'docker_path': None,
                     'kind': 'lxc',
                     'lxc_info_path': None,
+                    'lxc_path': None,
                     'machinectl_path': None,
                     'python_path': None,
                     'username': None,