diff --git a/bookwyrm/templates/settings/federated_server.html b/bookwyrm/templates/settings/federated_server.html
index 0f18f6ac..520ab5dc 100644
--- a/bookwyrm/templates/settings/federated_server.html
+++ b/bookwyrm/templates/settings/federated_server.html
@@ -89,8 +89,10 @@
         {% csrf_token %}
         {% if server.status != 'blocked' %}
         <button class="button is-danger">{% trans "Block" %}</button>
+        <p class="help">{% trans "All users from this instance will be deactivated." %}</p>
         {% else %}
         <button class="button">{% trans "Un-block" %}</button>
+        <p class="help">{% trans "All users from this instance will be re-activated." %}</p>
         {% endif %}
     </form>
 </section>
diff --git a/bookwyrm/views/federation.py b/bookwyrm/views/federation.py
index 09f5040d..83bed32d 100644
--- a/bookwyrm/views/federation.py
+++ b/bookwyrm/views/federation.py
@@ -36,7 +36,9 @@ class Federation(View):
         paginated = Paginator(servers, PAGE_LENGTH)
 
         data = {
-            "servers": paginated.page(page), "sort": sort, "form": forms.ServerForm()
+            "servers": paginated.page(page),
+            "sort": sort,
+            "form": forms.ServerForm(),
         }
         return TemplateResponse(request, "settings/federation.html", data)
 
@@ -93,4 +95,11 @@ class FederatedServer(View):
         server = get_object_or_404(models.FederatedServer, id=server)
         server.status = "blocked" if server.status == "federated" else "federated"
         server.save()
+
+        # TODO: there needs to be differentiation between types of deactivated users
+        if server.status == "blocked":
+            server.user_set.update(is_active=False)
+        else:
+            server.user_set.update(is_active=True)
+
         return redirect("settings-federated-server", server.id)
diff --git a/bookwyrm/views/inbox.py b/bookwyrm/views/inbox.py
index 387efe9f..7997bd5c 100644
--- a/bookwyrm/views/inbox.py
+++ b/bookwyrm/views/inbox.py
@@ -70,7 +70,7 @@ def is_blocked_user_agent(request):
     user_agent = request.headers.get("User-Agent")
     if not user_agent:
         return False
-    url = re.search(r"+https?://{:s}/?".format(regex.domain), user_agent)
+    url = re.search(r"https?://{:s}/?".format(regex.domain), user_agent).group()
     domain = urlparse(url).netloc
     if not domain:
         # idk, we'll try again later with the actor