diff --git a/src/user-federation/ldap/LdapSettingsConnection.tsx b/src/user-federation/ldap/LdapSettingsConnection.tsx
index 5b7d0214c0..7b0d4f0c28 100644
--- a/src/user-federation/ldap/LdapSettingsConnection.tsx
+++ b/src/user-federation/ldap/LdapSettingsConnection.tsx
@@ -195,6 +195,7 @@ export const LdapSettingsConnection = ({
         >
           <TextInput
             type="number"
+            min={0}
             id="kc-console-connection-timeout"
             name="config.connectionTimeout[0]"
             ref={form.register}
diff --git a/src/user-federation/ldap/LdapSettingsSearching.tsx b/src/user-federation/ldap/LdapSettingsSearching.tsx
index f7d7e25bac..654d254b8d 100644
--- a/src/user-federation/ldap/LdapSettingsSearching.tsx
+++ b/src/user-federation/ldap/LdapSettingsSearching.tsx
@@ -330,6 +330,7 @@ export const LdapSettingsSearching = ({
         >
           <TextInput
             type="number"
+            min={0}
             id="kc-read-timeout"
             name="config.readTimeout[0]"
             ref={form.register}
diff --git a/src/user-federation/ldap/LdapSettingsSynchronization.tsx b/src/user-federation/ldap/LdapSettingsSynchronization.tsx
index 81b7deba4a..b6dbccfb79 100644
--- a/src/user-federation/ldap/LdapSettingsSynchronization.tsx
+++ b/src/user-federation/ldap/LdapSettingsSynchronization.tsx
@@ -72,6 +72,7 @@ export const LdapSettingsSynchronization = ({
         >
           <TextInput
             type="number"
+            min={0}
             id="kc-batch-size"
             name="config.batchSizeForSync[0]"
             ref={form.register}
@@ -93,6 +94,7 @@ export const LdapSettingsSynchronization = ({
         >
           <TextInput
             type="number"
+            min={-1}
             id="kc-full-sync-period"
             name="config.fullSyncPeriod[0]"
             ref={form.register}
@@ -114,6 +116,7 @@ export const LdapSettingsSynchronization = ({
         >
           <TextInput
             type="number"
+            min={-1}
             id="kc-changed-users-sync-period"
             name="config.changedSyncPeriod[0]"
             ref={form.register}