diff --git a/OhadSoft.AzureLetsEncrypt.Renewal/OhadSoft.AzureLetsEncrypt.Renewal.WebJob.Tests/CLI/CliTests.cs b/OhadSoft.AzureLetsEncrypt.Renewal/OhadSoft.AzureLetsEncrypt.Renewal.WebJob.Tests/CLI/CliTests.cs
index 0ae6778..8f1d764 100644
--- a/OhadSoft.AzureLetsEncrypt.Renewal/OhadSoft.AzureLetsEncrypt.Renewal.WebJob.Tests/CLI/CliTests.cs
+++ b/OhadSoft.AzureLetsEncrypt.Renewal/OhadSoft.AzureLetsEncrypt.Renewal.WebJob.Tests/CLI/CliTests.cs
@@ -17,7 +17,7 @@ public class CliTests : RenewalTestBase
             { ("-s", "--subscriptionId"), Subscription1.ToString() },
             { ("-t", "--tenantId"), Tenant1 },
             { ("-r", "--resourceGroup"), ResourceGroup1 },
-            { ("-w", "--webApp"), WebApp1 },
+            { ("-w", "--webApp"), WebApp1Name },
             { ("-o", "--hosts"), String.Join(";", Hosts1) },
             { ("-e", "--email"), Email1 },
             { ("-c", "--clientId"), ClientId1.ToString() },
diff --git a/OhadSoft.AzureLetsEncrypt.Renewal/OhadSoft.AzureLetsEncrypt.Renewal.WebJob.Tests/RenewalTestBase.cs b/OhadSoft.AzureLetsEncrypt.Renewal/OhadSoft.AzureLetsEncrypt.Renewal.WebJob.Tests/RenewalTestBase.cs
index c35f7d2..be6b672 100644
--- a/OhadSoft.AzureLetsEncrypt.Renewal/OhadSoft.AzureLetsEncrypt.Renewal.WebJob.Tests/RenewalTestBase.cs
+++ b/OhadSoft.AzureLetsEncrypt.Renewal/OhadSoft.AzureLetsEncrypt.Renewal.WebJob.Tests/RenewalTestBase.cs
@@ -17,7 +17,9 @@ public class RenewalTestBase
         protected const string ResourceGroup1 = "foo-resource-group";
         protected const string ResourceGroup2 = "bar-resource-group";
         protected const string ResourceGroupShared = "shared-resource-group";
-        protected const string WebApp1 = "fooApp";
+        protected const string SiteSlotName1 = "foo-slot";
+        protected const string WebApp1Name = "fooApp";
+        protected const string WebApp1 = WebApp1Name + "{" + SiteSlotName1 + "}";
         protected const string WebApp2 = "barApp";
         protected const string WebApp3 = "bazApp";
         protected const string Email1 = "foo@gmail.com";
@@ -28,7 +30,6 @@ public class RenewalTestBase
         protected const string ClientSecretShared = "shared-secret4real";
         protected const string ServicePlanResourceGroup1 = "foo-service-plan-resource-group";
         protected const string ServicePlanResourceGroupShared = "shared-service-plan-resource-group";
-        protected const string SiteSlotName1 = "foo-slot";
         protected const bool UseIpBasedSsl1 = true;
         protected const bool UseIpBasedSslShared = true;
         protected const int RsaKeyLength1 = 1024;
@@ -59,7 +60,7 @@ public class RenewalTestBase
             Subscription1,
             Tenant1,
             ResourceGroup1,
-            WebApp1,
+            WebApp1Name,
             Hosts1,
             Email1,
             ClientId1,
@@ -79,7 +80,7 @@ public class RenewalTestBase
             Subscription1,
             Tenant1,
             ResourceGroup1,
-            WebApp1,
+            WebApp1Name,
             Hosts1,
             Email1,
             ClientId1,
diff --git a/OhadSoft.AzureLetsEncrypt.Renewal/OhadSoft.AzureLetsEncrypt.Renewal.WebJob.Tests/WebJob/AppSettingsTests.cs b/OhadSoft.AzureLetsEncrypt.Renewal/OhadSoft.AzureLetsEncrypt.Renewal.WebJob.Tests/WebJob/AppSettingsTests.cs
index 5977614..67dec79 100644
--- a/OhadSoft.AzureLetsEncrypt.Renewal/OhadSoft.AzureLetsEncrypt.Renewal.WebJob.Tests/WebJob/AppSettingsTests.cs
+++ b/OhadSoft.AzureLetsEncrypt.Renewal/OhadSoft.AzureLetsEncrypt.Renewal.WebJob.Tests/WebJob/AppSettingsTests.cs
@@ -25,7 +25,6 @@ public class AppSettingsTests : RenewalTestBase
         private const string ClientIdKeySuffix = "clientId";
         private const string ClientSecretKeySuffix = "clientSecret";
         private const string ServicePlanResourceGroupKeySuffix = "servicePlanResourceGroup";
-        private const string SiteSlotNameSuffix = "siteSlotName";
         private const string UseIpBasedSslKeySuffix = "useIpBasedSsl";
         private const string RsaKeyLengthKeySuffix = "rsaKeyLength";
         private const string AcmeBaseUriKeySuffix = "acmeBaseUri";
@@ -52,7 +51,6 @@ public class AppSettingsTests : RenewalTestBase
             { BuildConfigKey(HostsKeySuffix, WebApp1), String.Join(";", Hosts1) },
             { BuildConfigKey(EmailKeySuffix, WebApp1), Email1 },
             { BuildConfigKey(ClientIdKeySuffix, WebApp1), ClientId1.ToString() }, // override shared
-            { BuildConfigKey(SiteSlotNameSuffix, WebApp1), SiteSlotName1 },
             { BuildConfigKey(UseIpBasedSslKeySuffix, WebApp1), UseIpBasedSsl1.ToString() },
             { BuildConfigKey(RsaKeyLengthKeySuffix, WebApp1), RsaKeyLength1.ToString(CultureInfo.InvariantCulture) },
             { BuildConfigKey(AcmeBaseUriKeySuffix, WebApp1), AcmeBaseUri1.ToString() },
@@ -147,7 +145,16 @@ public void TestInvalidServicePlanResourceGroup()
         [TestMethod]
         public void TestInvalidSiteSlotName()
         {
-            AssertInvalidConfig(SiteSlotNameSuffix, WebApp2, " ", "siteSlotName", testMissing: false, testShared: false);
+            const string webApp = "foo{ }";
+
+            m_appSettings[BuildConfigKey(WebAppsKey)] = webApp;
+            m_appSettings[BuildConfigKey(SubscriptionIdKeySuffix, webApp)] = Subscription1.ToString();
+            m_appSettings[BuildConfigKey(TenantIdKeySuffix, webApp)] = Tenant1;
+            m_appSettings[BuildConfigKey(ResourceGroupKeySuffix, webApp)] = ResourceGroup1;
+            m_appSettings[BuildConfigKey(HostsKeySuffix, webApp)] = String.Join(";", Hosts1);
+            m_appSettings[BuildConfigKey(EmailKeySuffix, webApp)] = Email1;
+
+            AssertInvalidConfigCore("siteSlotName");
         }
 
         [TestMethod]
diff --git a/OhadSoft.AzureLetsEncrypt.Renewal/OhadSoft.AzureLetsEncrypt.Renewal.WebJob/AppSettings/AppSettingsRenewalParamsReader.cs b/OhadSoft.AzureLetsEncrypt.Renewal/OhadSoft.AzureLetsEncrypt.Renewal.WebJob/AppSettings/AppSettingsRenewalParamsReader.cs
index 53c4098..4bb7271 100644
--- a/OhadSoft.AzureLetsEncrypt.Renewal/OhadSoft.AzureLetsEncrypt.Renewal.WebJob/AppSettings/AppSettingsRenewalParamsReader.cs
+++ b/OhadSoft.AzureLetsEncrypt.Renewal/OhadSoft.AzureLetsEncrypt.Renewal.WebJob/AppSettings/AppSettingsRenewalParamsReader.cs
@@ -4,6 +4,7 @@
 using System.Diagnostics;
 using System.Linq;
 using System.Text;
+using System.Text.RegularExpressions;
 using OhadSoft.AzureLetsEncrypt.Renewal.Management;
 
 namespace OhadSoft.AzureLetsEncrypt.Renewal.WebJob.AppSettings
@@ -61,19 +62,29 @@ private RenewalParameters GetWebAppRenewalInfo(string webApp, SharedRenewalParam
         {
             Trace.TraceInformation("Parsing SSL renewal parameters for web app '{0}'...", webApp);
 
+            string webAppName = webApp;
+            string siteSlotName = null;
+
+            var match = Regex.Match(webApp, "^(.*){(.*)}$");
+            if (match.Success)
+            {
+                webAppName = match.Groups[1].Value;
+                siteSlotName = match.Groups[2].Value;
+            }
+
             try
             {
                 return new RenewalParameters(
                     ResolveGuidSetting(Constants.SubscriptionIdKey, webApp, sharedRenewalParams.SubscriptionId),
                     ResolveSetting(Constants.TenantIdKey, webApp, sharedRenewalParams.TenantId),
                     ResolveSetting(Constants.ResourceGroupKey, webApp, sharedRenewalParams.ResourceGroup),
-                    webApp,
+                    webAppName,
                     m_appSettings.GetDelimitedList(BuildConfigKey(Constants.HostsKey, webApp)),
                     ResolveSetting(Constants.EmailKey, webApp, sharedRenewalParams.Email),
                     ResolveGuidSetting(Constants.ClientIdKey, webApp, sharedRenewalParams.ClientId),
                     ResolveConnectionString(Constants.ClientSecretKey, webApp, sharedRenewalParams.ClientSecret),
                     ResolveOptionalSetting(Constants.ServicePlanResourceGroupKey, webApp, sharedRenewalParams.ServicePlanResourceGroup),
-                    ResolveOptionalSetting(Constants.SiteSlotNameKey, webApp),
+                    siteSlotName,
                     ResolveOptionalBooleanSetting(Constants.UseIpBasedSslKey, webApp, sharedRenewalParams.UseIpBasedSsl, false),
                     ResolveOptionalInt32Setting(Constants.RsaKeyLengthKey, webApp, sharedRenewalParams.RsaKeyLength, 2048),
                     ResolveOptionalUriSetting(Constants.AcmeBaseUriKey, webApp, sharedRenewalParams.AcmeBaseUri),