--- a/ServerMonitor/Controls/SshCheckControl.cs	Mon Dec 31 18:32:14 2018 -0500
+++ b/ServerMonitor/Controls/SshCheckControl.cs	Tue Jan 01 21:14:47 2019 -0500
@@ -34,11 +34,33 @@
             SshCheck check = (SshCheck)check1;
             check.Command = CommandTextBox.Text.Trim();
             check.CheckExitCode = ExitCodeCheckBox.Checked;
-            check.ExitCode = int.Parse(ExitCodeTextBox.Text);
+            try
+            {
+                check.ExitCode = int.Parse(ExitCodeTextBox.Text);
+            }
+            catch
+            {
+                if (check.CheckExitCode)
+                    throw new UpdateCheckException("Exit code must be an integer.");
+                else
+                    check.ExitCode = 0;
+            }
             check.CheckCommandOutput = CommandOutputCheckBox.Checked;
             check.CommandOutputMatchType = (MatchType)CommandOutputComboBox.SelectedIndex;
+            if (check.CheckCommandOutput && check.CommandOutputMatchType.In(MatchType.GreaterThan, MatchType.LessThan) && !decimal.TryParse(CommandOutputTextBox.Text, out decimal _))
+            {
+                throw new UpdateCheckException("Command output must be numeric if checking for greater than/less than.");
+            }
             check.CommandOutputPattern = CommandOutputTextBox.Text;
             check.CommandOutputUseRegex = CommandOutputRegexCheckBox.Checked;
         }
+
+        private void CommandOutputComboBox_SelectedIndexChanged(object sender, EventArgs e)
+        {
+            bool numeric = ((MatchType)CommandOutputComboBox.SelectedIndex).In(MatchType.GreaterThan, MatchType.LessThan);
+            CommandOutputRegexCheckBox.Enabled = !numeric;
+            if (numeric)
+                CommandOutputRegexCheckBox.Checked = false;
+        }
     }
 }