diff --git a/backend/src/main/java/edu/internet2/tier/shibboleth/admin/ui/configuration/MetadataResolverConfiguration.java b/backend/src/main/java/edu/internet2/tier/shibboleth/admin/ui/configuration/MetadataResolverConfiguration.java
index 3b2eab911..0222ba46e 100644
--- a/backend/src/main/java/edu/internet2/tier/shibboleth/admin/ui/configuration/MetadataResolverConfiguration.java
+++ b/backend/src/main/java/edu/internet2/tier/shibboleth/admin/ui/configuration/MetadataResolverConfiguration.java
@@ -1,5 +1,6 @@
 package edu.internet2.tier.shibboleth.admin.ui.configuration;
 
+import edu.internet2.tier.shibboleth.admin.ui.domain.resolvers.opensaml.OpenSamlChainingMetadataResolver;
 import edu.internet2.tier.shibboleth.admin.ui.opensaml.OpenSamlObjects;
 import edu.internet2.tier.shibboleth.admin.ui.repository.MetadataResolverRepository;
 import edu.internet2.tier.shibboleth.admin.ui.service.IndexWriterService;
@@ -39,7 +40,7 @@ public class MetadataResolverConfiguration {
 
     @Bean
     public MetadataResolver metadataResolver() throws ResolverException, ComponentInitializationException {
-        ChainingMetadataResolver metadataResolver = new ChainingMetadataResolver();
+        ChainingMetadataResolver metadataResolver = new OpenSamlChainingMetadataResolver();
         metadataResolver.setId("chain");
 
         List<MetadataResolver> resolvers = new ArrayList<>();
diff --git a/backend/src/main/java/edu/internet2/tier/shibboleth/admin/ui/domain/resolvers/opensaml/OpenSamlChainingMetadataResolver.java b/backend/src/main/java/edu/internet2/tier/shibboleth/admin/ui/domain/resolvers/opensaml/OpenSamlChainingMetadataResolver.java
new file mode 100644
index 000000000..e5265cc29
--- /dev/null
+++ b/backend/src/main/java/edu/internet2/tier/shibboleth/admin/ui/domain/resolvers/opensaml/OpenSamlChainingMetadataResolver.java
@@ -0,0 +1,60 @@
+package edu.internet2.tier.shibboleth.admin.ui.domain.resolvers.opensaml;
+
+import com.google.common.base.Predicates;
+import com.google.common.collect.Collections2;
+import net.shibboleth.utilities.java.support.annotation.constraint.NonnullElements;
+import net.shibboleth.utilities.java.support.component.ComponentInitializationException;
+import net.shibboleth.utilities.java.support.resolver.ResolverException;
+import org.opensaml.saml.metadata.resolver.ChainingMetadataResolver;
+import org.opensaml.saml.metadata.resolver.MetadataResolver;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.annotation.Nonnull;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * @author Bill Smith (wsmith@unicon.net)
+ */
+public class OpenSamlChainingMetadataResolver extends ChainingMetadataResolver {
+    @Nonnull private final Logger log = LoggerFactory.getLogger(OpenSamlChainingMetadataResolver.class);
+
+    @Nonnull @NonnullElements private List<MetadataResolver> mutableResolvers;
+
+    public OpenSamlChainingMetadataResolver() {
+        this.mutableResolvers = Collections.emptyList();
+    }
+
+    public OpenSamlChainingMetadataResolver(@Nonnull List<MetadataResolver> mutableResolvers) {
+        this.mutableResolvers = mutableResolvers;
+    }
+
+    @Override
+    public void setResolvers(@Nonnull @NonnullElements final List<? extends MetadataResolver> newResolvers)
+            throws ResolverException {
+        if (newResolvers == null || newResolvers.isEmpty()) {
+            mutableResolvers = Collections.emptyList();
+            return;
+        }
+
+        mutableResolvers = new ArrayList<>(Collections2.filter(newResolvers, Predicates.notNull()));
+    }
+
+    @Nonnull
+    @NonnullElements
+    @Override
+    public List<MetadataResolver> getResolvers() {
+        return mutableResolvers;
+    }
+
+    @Override
+    protected void doInitialize() throws ComponentInitializationException {
+        super.doInitialize();
+        if (mutableResolvers == null) {
+            log.warn("OpenSamlChainingMetadataResolver was not configured with any member MetadataResolvers");
+            mutableResolvers = Collections.emptyList();
+        }
+    }
+}
diff --git a/backend/src/test/groovy/edu/internet2/tier/shibboleth/admin/ui/configuration/TestConfiguration.groovy b/backend/src/test/groovy/edu/internet2/tier/shibboleth/admin/ui/configuration/TestConfiguration.groovy
index 2cb3c7d9d..1796e3b70 100644
--- a/backend/src/test/groovy/edu/internet2/tier/shibboleth/admin/ui/configuration/TestConfiguration.groovy
+++ b/backend/src/test/groovy/edu/internet2/tier/shibboleth/admin/ui/configuration/TestConfiguration.groovy
@@ -1,5 +1,6 @@
 package edu.internet2.tier.shibboleth.admin.ui.configuration
 
+import edu.internet2.tier.shibboleth.admin.ui.domain.resolvers.opensaml.OpenSamlChainingMetadataResolver
 import edu.internet2.tier.shibboleth.admin.ui.opensaml.OpenSamlObjects
 import edu.internet2.tier.shibboleth.admin.ui.repository.MetadataResolverRepository
 import edu.internet2.tier.shibboleth.admin.ui.service.IndexWriterService
@@ -36,7 +37,7 @@ class TestConfiguration {
 
     @Bean
     MetadataResolver metadataResolver() {
-        ChainingMetadataResolver metadataResolver = new ChainingMetadataResolver()
+        ChainingMetadataResolver metadataResolver = new OpenSamlChainingMetadataResolver()
         metadataResolver.setId("chain")
         String resolverId = "test"
 
diff --git a/ui/src/assets/schema/provider/filebacked-http-common.editor.schema.json b/ui/src/assets/schema/provider/filebacked-http-common.editor.schema.json
index 2b5d368e4..ca8ea2646 100644
--- a/ui/src/assets/schema/provider/filebacked-http-common.editor.schema.json
+++ b/ui/src/assets/schema/provider/filebacked-http-common.editor.schema.json
@@ -159,7 +159,23 @@
                 "initializeFromBackupFile": [
                     true
                 ]
-            }
+            },
+            "widget": {
+                "id": "datalist",
+                "data": [
+                    "PT0S",
+                    "PT30S",
+                    "PT1M",
+                    "PT10M",
+                    "PT30M",
+                    "PT1H",
+                    "PT4H",
+                    "PT12H",
+                    "PT24H"
+                ]
+            },
+            "default": null,
+            "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
         },
         "requireValidMetadata": {
             "title": "Require Valid Metadata?",
diff --git a/ui/src/assets/schema/provider/filebacked-http-common.schema.json b/ui/src/assets/schema/provider/filebacked-http-common.schema.json
index 4e01b4f76..2b318c44c 100644
--- a/ui/src/assets/schema/provider/filebacked-http-common.schema.json
+++ b/ui/src/assets/schema/provider/filebacked-http-common.schema.json
@@ -96,7 +96,23 @@
                 "initializeFromBackupFile": [
                     true
                 ]
-            }
+            },
+            "widget": {
+                "id": "datalist",
+                "data": [
+                    "PT0S",
+                    "PT30S",
+                    "PT1M",
+                    "PT10M",
+                    "PT30M",
+                    "PT1H",
+                    "PT4H",
+                    "PT12H",
+                    "PT24H"
+                ]
+            },
+            "default": null,
+            "pattern": "^(R\\d*\\/)?P(?:\\d+(?:\\.\\d+)?Y)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?W)?(?:\\d+(?:\\.\\d+)?D)?(?:T(?:\\d+(?:\\.\\d+)?H)?(?:\\d+(?:\\.\\d+)?M)?(?:\\d+(?:\\.\\d+)?S)?)?$"
         },
         "requireValidMetadata": {
             "title": "Require Valid Metadata?",