diff --git a/lib/easy.c b/lib/easy.c
index d16fa8c07a..ac8fab3422 100644
--- a/lib/easy.c
+++ b/lib/easy.c
@@ -940,6 +940,7 @@ CURL *curl_easy_duphandle(CURL *d)
     goto fail;
 
   Curl_dyn_init(&outcurl->state.headerb, CURL_MAX_HTTP_HEADER);
+  Curl_netrc_init(&outcurl->state.netrc);
 
   /* the connection pool is setup on demand */
   outcurl->state.lastconnect_id = -1;
diff --git a/tests/data/Makefile.am b/tests/data/Makefile.am
index 02bf2ae25b..ea5221c00f 100644
--- a/tests/data/Makefile.am
+++ b/tests/data/Makefile.am
@@ -255,7 +255,7 @@ test2100 \
 test2200 test2201 test2202 test2203 test2204 test2205 \
 \
 test2300 test2301 test2302 test2303 test2304 test2305 test2306 test2307 \
-test2308 \
+test2308 test2309 \
 \
 test2400 test2401 test2402 test2403 test2404 test2405 test2406 \
 \
diff --git a/tests/data/test2309 b/tests/data/test2309
new file mode 100644
index 0000000000..4ba78ee91e
--- /dev/null
+++ b/tests/data/test2309
@@ -0,0 +1,66 @@
+<testcase>
+<info>
+<keywords>
+netrc
+HTTP
+</keywords>
+</info>
+#
+# Server-side
+<reply>
+<data crlf="yes" nocheck="yes">
+HTTP/1.1 200 OK
+Date: Tue, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Last-Modified: Tue, 13 Jun 2000 12:10:00 GMT
+ETag: "21025-dc7-39462498"
+Accept-Ranges: bytes
+Content-Length: 6
+Connection: close
+Content-Type: text/html
+Funny-head: yesyes
+
+-foo-
+</data>
+</reply>
+
+#
+# Client-side
+<client>
+<server>
+http
+</server>
+<features>
+proxy
+</features>
+
+# Reproducing issue 15496
+<name>
+HTTP with .netrc using duped easy handle
+</name>
+<tool>
+lib%TESTNUMBER
+</tool>
+<command>
+http://github.com %LOGDIR/netrc%TESTNUMBER http://%HOSTIP:%HTTPPORT/
+</command>
+<file name="%LOGDIR/netrc%TESTNUMBER" >
+
+machine github.com
+
+login daniel
+password $y$j9T$WUVjiVvDbRAWafDLs6cab1$01NX.oaZKf5lw8MR2Nk9Yaxv4CqbE0IaDF.GpGxPul1
+</file>
+</client>
+
+<verify>
+<protocol>
+GET http://github.com/ HTTP/1.1
+Host: github.com
+Authorization: Basic %b64[daniel:$y$j9T$WUVjiVvDbRAWafDLs6cab1$01NX.oaZKf5lw8MR2Nk9Yaxv4CqbE0IaDF.GpGxPul1]b64%
+Accept: */*
+Proxy-Connection: Keep-Alive
+
+</protocol>
+</verify>
+</testcase>
diff --git a/tests/libtest/Makefile.inc b/tests/libtest/Makefile.inc
index 339a00fc4e..8f58fd6422 100644
--- a/tests/libtest/Makefile.inc
+++ b/tests/libtest/Makefile.inc
@@ -77,7 +77,7 @@ LIBTESTPROGS = libauthretry libntlmconnect libprereq                     \
  lib1945 lib1946 lib1947 lib1948 lib1955 lib1956 lib1957 lib1958 lib1959 \
  lib1960 lib1964 \
  lib1970 lib1971 lib1972 lib1973 lib1974 lib1975 \
- lib2301 lib2302 lib2304 lib2305 lib2306         lib2308 \
+ lib2301 lib2302 lib2304 lib2305 lib2306         lib2308 lib2309 \
  lib2402 lib2404 lib2405 \
  lib2502 \
  lib3010 lib3025 lib3026 lib3027 \
@@ -683,6 +683,9 @@ lib2306_LDADD = $(TESTUTIL_LIBS)
 lib2308_SOURCES = lib2308.c $(SUPPORTFILES)
 lib2308_LDADD = $(TESTUTIL_LIBS)
 
+lib2309_SOURCES = lib2309.c $(SUPPORTFILES)
+lib2309_LDADD = $(TESTUTIL_LIBS)
+
 lib2402_SOURCES = lib2402.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
 lib2402_LDADD = $(TESTUTIL_LIBS)
 
diff --git a/tests/libtest/lib2309.c b/tests/libtest/lib2309.c
new file mode 100644
index 0000000000..11f1c1fbd8
--- /dev/null
+++ b/tests/libtest/lib2309.c
@@ -0,0 +1,66 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ * SPDX-License-Identifier: curl
+ *
+ ***************************************************************************/
+
+#include "test.h"
+#include "testtrace.h"
+
+#include <curl/curl.h>
+
+static size_t cb_ignore(char *buffer, size_t size, size_t nmemb, void *userp)
+{
+  (void)buffer;
+  (void)size;
+  (void)nmemb;
+  (void)userp;
+  return CURL_WRITEFUNC_ERROR;
+}
+
+CURLcode test(char *URL)
+{
+  CURL *curl;
+  CURL *curldupe;
+  CURLcode res = CURLE_OK;
+
+  global_init(CURL_GLOBAL_ALL);
+  curl = curl_easy_init();
+  if(curl) {
+    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, cb_ignore);
+    curl_easy_setopt(curl, CURLOPT_URL, URL);
+    curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
+    curl_easy_setopt(curl, CURLOPT_PROXY, libtest_arg3);
+    curl_easy_setopt(curl, CURLOPT_NETRC, (long)CURL_NETRC_REQUIRED);
+    curl_easy_setopt(curl, CURLOPT_NETRC_FILE, libtest_arg2);
+
+    curldupe = curl_easy_duphandle(curl);
+    if(curldupe) {
+      res = curl_easy_perform(curldupe);
+      printf("Returned %d, should be %d.\n", res, CURLE_WRITE_ERROR);
+      fflush(stdout);
+      curl_easy_cleanup(curldupe);
+    }
+    curl_easy_cleanup(curl);
+  }
+  curl_global_cleanup();
+  return CURLE_OK;
+}