diff --git a/src/main/java/org/codelibs/fess/es/config/exentity/WebConfig.java b/src/main/java/org/codelibs/fess/es/config/exentity/WebConfig.java
index 41c6fdfc8..ae945dc95 100644
--- a/src/main/java/org/codelibs/fess/es/config/exentity/WebConfig.java
+++ b/src/main/java/org/codelibs/fess/es/config/exentity/WebConfig.java
@@ -23,6 +23,7 @@ import java.util.List;
 import java.util.Map;
 import java.util.regex.Pattern;
 
+import org.apache.http.auth.UsernamePasswordCredentials;
 import org.codelibs.core.lang.StringUtil;
 import org.codelibs.fess.Constants;
 import org.codelibs.fess.app.service.RequestHeaderService;
@@ -237,6 +238,12 @@ public class WebConfig extends BsWebConfig implements CrawlingConfig {
         paramMap.put(HcHttpClient.REQUERT_HEADERS_PROPERTY,
                 rhList.toArray(new org.codelibs.fess.crawler.client.http.RequestHeader[rhList.size()]));
 
+        // proxy credentials
+        if (paramMap.get("proxyUsername") == null && paramMap.get("proxyPassword") == null) {
+            paramMap.put(HcHttpClient.PROXY_CREDENTIALS_PROPERTY, new UsernamePasswordCredentials(paramMap.remove("proxyUsername")
+                    .toString(), paramMap.remove("proxyPassword").toString()));
+        }
+
         return paramMap;
     }