diff --git a/README.md b/README.md
index c79ee520..ef1bf40d 100644
--- a/README.md
+++ b/README.md
@@ -75,7 +75,6 @@ docker::run { 'puppetboard':
 }
 ```
 
-
 We also provide the Dockerfile so you can build the image yourself:
 ```bash
 docker build -t puppetboard .
@@ -161,7 +160,7 @@ Other settings that might be interesting in no particular order:
 -   `SECRET_KEY`: Refer to [Flask documentation](https://flask.palletsprojects.com/en/1.1.x/quickstart/#sessions),
     section "How to generate good secret keys" for more info. Defaults to a random 24-char string generated by
     `os.random(24)`.
--   `PUPPETDB_TIMEOUT`: Defaults to 20 seconds but you might need to increase this value. It depends on how big the
+-   `PUPPETDB_TIMEOUT`: Defaults to 20 seconds, but you might need to increase this value. It depends on how big the
     results are when querying PuppetDB. This behaviour will change in a future release when pagination will be introduced.
 -   `UNRESPONSIVE_HOURS`: The amount of hours since the last check-in after which a node is considered unresponsive.
 -   `LOGLEVEL`: A string representing the loglevel. It defaults to `'info'` but can be changed to `'warning'` or
@@ -200,7 +199,7 @@ Other settings that might be interesting in no particular order:
     to `False` gives performance benefits, especially in big Puppet environments (more than few hundreds of nodes).
     Defaults to `True`.
 -   `DEV_LISTEN_HOST`: For use with dev.py for development. Default is localhost
--   `DEV_LISTEN_PORT`: For use with dev.py for development. Default is 5000
+-   `DEV_LISTEN_PORT`: For use with dev.py for development. Default is 5555
 
 ## Getting Help
 
diff --git a/puppetboard/app.py b/puppetboard/app.py
index 5463c330..17822068 100644
--- a/puppetboard/app.py
+++ b/puppetboard/app.py
@@ -27,6 +27,8 @@
 import puppetboard.views.radiator  # noqa: F401
 # noinspection PyUnresolvedReferences
 import puppetboard.views.reports  # noqa: F401
+# noinspection PyUnresolvedReferences
+import puppetboard.views.failures  # noqa: F401
 
 
 from puppetboard.core import get_app, get_puppetdb
@@ -41,6 +43,7 @@
 
 menu_entries = [
     ('index', 'Overview'),
+    ('failures', 'Failures'),
     ('nodes', 'Nodes'),
     ('facts', 'Facts'),
     ('reports', 'Reports'),
@@ -48,7 +51,7 @@
     ('inventory', 'Inventory'),
     ('catalogs', 'Catalogs'),
     ('radiator', 'Radiator'),
-    ('query', 'Query')
+    ('query', 'Query'),
 ]
 
 if not app.config.get('ENABLE_QUERY'):
diff --git a/puppetboard/core.py b/puppetboard/core.py
index fcf90ae6..2aa5dcac 100644
--- a/puppetboard/core.py
+++ b/puppetboard/core.py
@@ -76,6 +76,8 @@ def environments():
     return x
 
 
+# as documented in
+# https://flask.palletsprojects.com/en/2.0.x/patterns/streaming/#streaming-from-templates
 def stream_template(template_name, **context):
     app = get_app()
     app.update_template_context(context)
diff --git a/puppetboard/default_settings.py b/puppetboard/default_settings.py
index a9d48b1f..1fdc2b24 100644
--- a/puppetboard/default_settings.py
+++ b/puppetboard/default_settings.py
@@ -10,7 +10,7 @@
 DEFAULT_ENVIRONMENT = 'production'
 SECRET_KEY = os.urandom(24)
 DEV_LISTEN_HOST = '127.0.0.1'
-DEV_LISTEN_PORT = 5000
+DEV_LISTEN_PORT = 5555
 DEV_COFFEE_LOCATION = 'coffee'
 UNRESPONSIVE_HOURS = 2
 ENABLE_QUERY = True
@@ -53,3 +53,6 @@
 DAILY_REPORTS_CHART_ENABLED = True
 DAILY_REPORTS_CHART_DAYS = 8
 WITH_EVENT_NUMBERS = True
+
+SHOW_ERROR_AS = 'friendly'  # or 'raw'
+CODE_PREFIX_TO_REMOVE = '/etc/puppetlabs/code/environments'
diff --git a/puppetboard/docker_settings.py b/puppetboard/docker_settings.py
index e89813e5..05d8808a 100644
--- a/puppetboard/docker_settings.py
+++ b/puppetboard/docker_settings.py
@@ -60,7 +60,7 @@ def coerce_bool(v, default):
 DEFAULT_ENVIRONMENT = os.getenv('DEFAULT_ENVIRONMENT', 'production')
 SECRET_KEY = os.getenv('SECRET_KEY', os.urandom(24))
 DEV_LISTEN_HOST = os.getenv('DEV_LISTEN_HOST', '127.0.0.1')
-DEV_LISTEN_PORT = int(os.getenv('DEV_LISTEN_PORT', '5000'))
+DEV_LISTEN_PORT = int(os.getenv('DEV_LISTEN_PORT', '5555'))
 DEV_COFFEE_LOCATION = os.getenv('DEV_COFFEE_LOCATION', 'coffee')
 UNRESPONSIVE_HOURS = int(os.getenv('UNRESPONSIVE_HOURS', '2'))
 ENABLE_QUERY = os.getenv('ENABLE_QUERY', 'True')
@@ -125,3 +125,6 @@ def coerce_bool(v, default):
 DAILY_REPORTS_CHART_DAYS = int(os.getenv('DAILY_REPORTS_CHART_DAYS', '8'))
 
 WITH_EVENT_NUMBERS = coerce_bool(os.getenv('WITH_EVENT_NUMBERS'), True)
+
+SHOW_ERROR_AS = os.getenv('SHOW_ERROR_AS', 'friendly')
+CODE_PREFIX_TO_REMOVE = os.getenv('CODE_PREFIX_TO_REMOVE', '/etc/puppetlabs/code/environments')
diff --git a/puppetboard/static/css/puppetboard.css b/puppetboard/static/css/puppetboard.css
index 43801db4..9051351e 100644
--- a/puppetboard/static/css/puppetboard.css
+++ b/puppetboard/static/css/puppetboard.css
@@ -226,7 +226,8 @@ a .key:hover {
 
 textarea, /* query */
 pre.result,
-pre.error_message {
+pre.error_message,
+td.error_message {
   font-family: "Cousine", monospace;
   font-size: 1rem;
 }
diff --git a/puppetboard/templates/failures.html b/puppetboard/templates/failures.html
new file mode 100644
index 00000000..021af1b3
--- /dev/null
+++ b/puppetboard/templates/failures.html
@@ -0,0 +1,56 @@
+{% extends 'layout.html' %}
+{% import '_macros.html' as macros %}
+{% block content %}
+<div class="ui fluid icon input hide" style="margin-bottom:20px">
+  <input autofocus="autofocus" class="filter-table" placeholder="Type here to filter...">
+</div>
+<div id="checkbox_div" class="ui toggle {% if (current_show_error_as == 'friendly') %}checked{% endif %} checkbox">
+    <input type="checkbox" {% if (current_show_error_as == 'friendly') %}checked=""{% endif %}">
+    <label>Friendly error messages</label>
+</div>
+<table id="failures_table" class='ui basic vertically padded sortable fixed wrapped table'>
+  <thead>
+    <tr>
+      <th class="default default-sort four wide">Certname</th>
+      <th class="date two wide">Report time</th>
+      <th class="date ten wide">Error</th>
+    </tr>
+  </thead>
+  <tbody class="searchable">
+    {% for failure in failures %}
+    <tr>
+      <td>
+        <a href="{{url_for('node', env=current_env, node_name=failure.certname)}}">
+          {{failure.certname}}
+        </a>
+      </td>
+      <td>
+        <a href="{{url_for('report', env=current_env, node_name=failure.certname, report_id=failure.report_hash)}}" rel="utctimestamp">
+            {{failure.timestamp}}
+        </a>
+      </td>
+      <td class="negative error_message">
+          {{failure.error | safe}}
+      </td>
+    </tr>
+    {% endfor %}
+  </tbody>
+</table>
+
+<script>
+$('#checkbox_div').checkbox(
+    'setting', 'onChange', function() {
+        let url = window.location.href;
+        if (url.endsWith("/raw")) {
+            url = url.replaceAll(/\/raw$/ig, '/friendly')
+        } else if (url.endsWith("/friendly")) {
+            url = url.replaceAll(/\/friendly$/ig, '/raw')
+        } else {
+            url += '/raw'
+        }
+        window.location.href = url
+    }
+);
+</script>
+
+{% endblock content %}
diff --git a/puppetboard/views/failures.py b/puppetboard/views/failures.py
new file mode 100644
index 00000000..0d1222ed
--- /dev/null
+++ b/puppetboard/views/failures.py
@@ -0,0 +1,144 @@
+import re
+
+from flask import Response, stream_with_context, abort
+from pypuppetdb.QueryBuilder import AndOperator, EqualsOperator
+
+from puppetboard.core import get_app, get_puppetdb, environments, stream_template
+from puppetboard.utils import check_env, yield_or_stop
+
+app = get_app()
+puppetdb = get_puppetdb()
+
+
+def get_raw_error(source: str, message: str) -> str:
+    # prefix with source, if it's not trivial
+    if source != 'Puppet':
+        message = source + "\n\n" + message
+
+    if '\n' in message:
+        message = f"<pre>{message}</pre>"
+
+    return message
+
+
+def get_friendly_error(source: str, message: str, certname: str) -> str:
+    # NOTE: the order of the below operations matters in some cases!
+
+    # prefix with source, if it's not trivial
+    if source != 'Puppet':
+        message = source + "\n\n" + message
+
+    # shorten the file paths
+    code_prefix_to_remove = app.config['CODE_PREFIX_TO_REMOVE']
+    message = re.sub(f'file: {code_prefix_to_remove}', 'file: …', message)
+
+    # remove some unuseful parts
+    too_long_prefix = "Could not retrieve catalog from remote server: " \
+                      "Error 500 on SERVER: " \
+                      "Server Error: "
+    message = re.sub(f'^{too_long_prefix}', '', message)
+
+    message = re.sub(r"(Evaluation Error: Error while evaluating a )",
+                     r"Error while evaluating a ", message)
+
+    # remove redundant certnames
+    redundant_certname = f" on node {certname}"
+    message = re.sub(f'{redundant_certname}$', '', message)
+
+    redundant_certname = f" for {certname}"
+    message = re.sub(f'{redundant_certname} ', ' ', message)
+
+    # add extra line breaks for readability
+    message = re.sub(r"(Error while evaluating a .*?),",
+                     r"\1:\n\n", message)
+
+    message = re.sub(r"( returned \d+:) ",
+                     r"\1\n\n", message)
+
+    # reformat and rephrase ending expression that says where in the code is the error
+    # NOTE: this has to be done AFTER removing " on node ..."
+    # but BEFORE replacing spaces with &nbsp;
+    message = re.sub(r"(\S)\s+\(file: ([0-9a-zA-Z/_\-.…]+, line: \d+, column: \d+)\)\s*$",
+                     r"\1\n\n…in \2.", message)
+
+    message = re.sub(r"(\S)\s+\(file: ([0-9a-zA-Z/_\-.…]+, line: \d+)\)\s*$",
+                     r"\1\n\n…in \2.", message)
+
+    return message
+
+
+def to_html(message: str) -> str:
+    # replace \n with <br/> to not have to use <pre> which breaks wrapping
+    message = re.sub(r"\n", "<br/>", message)
+
+    # prevent line breaking inside expressions that provide code location
+    message = re.sub(r"\(file: (.*?), line: (.*?), column: (.*?)\)",
+                     r"(file:&nbsp;\1,&nbsp;line:&nbsp;\2,&nbsp;column:&nbsp;\3)", message)
+    message = re.sub(r"\(file: (.*?), line: (.*?)\)",
+                     r"(file:&nbsp;\1,&nbsp;line:&nbsp;\2)", message)
+
+    return message
+
+
+@app.route('/failures', defaults={'env': app.config['DEFAULT_ENVIRONMENT'],
+                                  'show_error_as': app.config['SHOW_ERROR_AS']})
+@app.route('/failures/<show_error_as>', defaults={'env': app.config['DEFAULT_ENVIRONMENT']})
+@app.route('/<env>/failures', defaults={'show_error_as': app.config['SHOW_ERROR_AS']})
+@app.route('/<env>/failures/<show_error_as>')
+def failures(env: str, show_error_as: str):
+    nodes_query = AndOperator()
+    nodes_query.add(EqualsOperator('latest_report_status', 'failed'))
+
+    envs = environments()
+    check_env(env, envs)
+    if env != '*':
+        nodes_query.add(EqualsOperator("catalog_environment", env))
+
+    if show_error_as not in ['friendly', 'raw']:
+        abort(404)
+
+    nodes = puppetdb.nodes(
+        query=nodes_query,
+        with_status=True,
+        with_event_numbers=False,
+    )
+
+    failures = []
+
+    for node in yield_or_stop(nodes):
+
+        report_query = AndOperator()
+        report_query.add(EqualsOperator('hash', node.latest_report_hash))
+
+        reports = puppetdb.reports(
+            query=report_query,
+        )
+
+        latest_failed_report = next(reports)
+
+        for log in latest_failed_report.logs:
+            if log['level'] not in ['info', 'notice', 'warning']:
+                if log['source'] != 'Facter':
+                    source = log['source']
+                    message = log['message']
+                    break
+
+        if show_error_as == 'friendly':
+            error = to_html(get_friendly_error(source, message, node.name))
+        else:
+            error = get_raw_error(source, message)
+
+        failure = {
+            'certname': node.name,
+            'timestamp': node.report_timestamp,
+            'error': error,
+            'report_hash': node.latest_report_hash,
+        }
+        failures.append(failure)
+
+    return Response(stream_with_context(
+        stream_template('failures.html',
+                        failures=failures,
+                        envs=envs,
+                        current_env=env,
+                        current_show_error_as=show_error_as)))