diff --git a/ui/opensnitch/dialogs/ruleseditor.py b/ui/opensnitch/dialogs/ruleseditor.py
index b35a048e42..9c513a8c8f 100644
--- a/ui/opensnitch/dialogs/ruleseditor.py
+++ b/ui/opensnitch/dialogs/ruleseditor.py
@@ -16,7 +16,13 @@
 from opensnitch.database import Database
 from opensnitch.database.enums import RuleFields, ConnFields
 from opensnitch.version import version
-from opensnitch.utils import Message, FileDialog, Icons, NetworkInterfaces
+from opensnitch.utils import (
+    Message,
+    FileDialog,
+    Icons,
+    NetworkInterfaces,
+    qvalidator
+)
 from opensnitch.rules import Rule, Rules
 
 DIALOG_UI_PATH = "%s/../res/ruleseditor.ui" % os.path.dirname(sys.modules[__name__].__file__)
@@ -33,6 +39,8 @@ class RulesEditorDialog(QtWidgets.QDialog, uic.loadUiType(DIALOG_UI_PATH)[0]):
     LAN_LABEL = "LAN"
     MULTICAST_LABEL = "MULTICAST"
 
+    INVALID_RULE_NAME_CHARS = '/'
+
     ADD_RULE = 0
     EDIT_RULE = 1
     WORK_MODE = ADD_RULE
@@ -55,6 +63,10 @@ def __init__(self, parent=None, _rule=None, appicon=None):
         self.setupUi(self)
         self.setWindowIcon(appicon)
 
+        self.ruleNameValidator = qvalidator.RestrictChars(RulesEditorDialog.INVALID_RULE_NAME_CHARS)
+        self.ruleNameValidator.result.connect(self._cb_rule_name_validator_result)
+        self.ruleNameEdit.setValidator(self.ruleNameValidator)
+
         self.buttonBox.setStandardButtons(
             QtWidgets.QDialogButtonBox.Help |
             QtWidgets.QDialogButtonBox.Reset |
@@ -138,6 +150,16 @@ def showEvent(self, event):
     def _bool(self, s):
         return s == 'True'
 
+    def _cb_rule_name_validator_result(self, result):
+        if result == QtGui.QValidator.Invalid:
+            self._set_status_error(
+                QC.translate("rules",
+                             "Invalid rule name (not allowed characters: '{0}' )".format(RulesEditorDialog.INVALID_RULE_NAME_CHARS)
+                             )
+            )
+        else:
+            self._set_status_message("")
+
     def _cb_accept_clicked(self):
         pass
 
diff --git a/ui/opensnitch/utils/qvalidator.py b/ui/opensnitch/utils/qvalidator.py
new file mode 100644
index 0000000000..881d4e6daf
--- /dev/null
+++ b/ui/opensnitch/utils/qvalidator.py
@@ -0,0 +1,25 @@
+
+from PyQt5 import QtCore, QtGui
+
+class RestrictChars(QtGui.QValidator):
+    result = QtCore.pyqtSignal(object)
+
+    def __init__(self, restricted_chars, *args, **kwargs):
+        QtGui.QValidator.__init__(self, *args, **kwargs)
+        self._restricted_chars = restricted_chars
+
+    def validate(self, value, pos):
+        # allow to delete all characters
+        if len(value) == 0:
+            return QtGui.QValidator.Intermediate, value, pos
+
+        # user can type characters or paste them.
+        # pos value when pasting can be any number, depending on where did the
+        # user paste the characters.
+        for char in self._restricted_chars:
+            if char in value:
+                self.result.emit(QtGui.QValidator.Invalid)
+                return QtGui.QValidator.Invalid, value, pos
+
+        self.result.emit(QtGui.QValidator.Acceptable)
+        return QtGui.QValidator.Acceptable, value, pos