diff --git a/flink-connector-opensearch/src/main/java/org/apache/flink/connector/opensearch/sink/DefaultRestClientFactory.java b/flink-connector-opensearch/src/main/java/org/apache/flink/connector/opensearch/sink/DefaultRestClientFactory.java
index 44d2060..354d618 100644
--- a/flink-connector-opensearch/src/main/java/org/apache/flink/connector/opensearch/sink/DefaultRestClientFactory.java
+++ b/flink-connector-opensearch/src/main/java/org/apache/flink/connector/opensearch/sink/DefaultRestClientFactory.java
@@ -24,6 +24,7 @@
 import org.apache.http.conn.ssl.TrustAllStrategy;
 import org.apache.http.impl.client.BasicCredentialsProvider;
 import org.apache.http.impl.nio.client.HttpAsyncClientBuilder;
+import org.apache.http.nio.conn.ssl.SSLIOSessionStrategy;
 import org.apache.http.ssl.SSLContexts;
 import org.opensearch.client.RestClientBuilder;
 
@@ -85,8 +86,12 @@ protected void configureHttpClientBuilder(
 
         if (networkClientConfig.isAllowInsecure().orElse(false)) {
             try {
-                httpClientBuilder.setSSLContext(
-                        SSLContexts.custom().loadTrustMaterial(new TrustAllStrategy()).build());
+                httpClientBuilder
+                        .setSSLContext(
+                                SSLContexts.custom()
+                                        .loadTrustMaterial(new TrustAllStrategy())
+                                        .build())
+                        .setSSLHostnameVerifier(SSLIOSessionStrategy.ALLOW_ALL_HOSTNAME_VERIFIER);
             } catch (final NoSuchAlgorithmException
                     | KeyStoreException
                     | KeyManagementException ex) {