diff --git a/docs/en/sql-reference/aggregate-functions/reference/groupconcat.md b/docs/en/sql-reference/aggregate-functions/reference/groupconcat.md
new file mode 100644
index 00000000000..072252de8c9
--- /dev/null
+++ b/docs/en/sql-reference/aggregate-functions/reference/groupconcat.md
@@ -0,0 +1,90 @@
+---
+slug: /en/sql-reference/aggregate-functions/reference/groupconcat
+sidebar_position: 363
+sidebar_label: groupConcat
+title: groupConcat
+---
+
+Calculates a concatenated string from a group of strings, optionally separated by a delimiter, and optionally limited by a maximum number of elements.
+
+**Syntax**
+
+``` sql
+groupConcat(expression [, delimiter] [, limit]);
+```
+
+**Arguments**
+
+- `expression` — The expression or column name that outputs strings to be concatenated..
+- `delimiter` — A [string](../../../sql-reference/data-types/string.md) that will be used to separate concatenated values. This parameter is optional and defaults to an empty string if not specified.
+- `limit` — A positive [integer](../../../sql-reference/data-types/int-uint.md) specifying the maximum number of elements to concatenate. If more elements are present, excess elements are ignored. This parameter is optional.
+
+:::note
+If delimiter is specified without limit, it must be the first parameter following the expression. If both delimiter and limit are specified, delimiter must precede limit.
+:::
+
+**Returned value**
+
+- Returns a [string](../../../sql-reference/data-types/string.md) consisting of the concatenated values of the column or expression. If the group has no elements or only null elements, and the function does not specify a handling for only null values, the result is a nullable string with a null value.
+
+**Examples**
+
+Input table:
+
+``` text
+┌─id─┬─name─┐
+│ 1  │  John│
+│ 2  │  Jane│
+│ 3  │   Bob│
+└────┴──────┘
+```
+
+1.	Basic usage without a delimiter:
+
+Query:
+
+``` sql
+SELECT groupConcat(Name) FROM Employees;
+```
+
+Result:
+
+``` text
+JohnJaneBob
+```
+
+This concatenates all names into one continuous string without any separator.
+
+
+2. Using comma as a delimiter:
+
+Query:
+
+``` sql
+SELECT groupConcat(Name, ', ', 2) FROM Employees;
+```
+
+Result:
+
+``` text
+John, Jane, Bob
+```
+
+This output shows the names separated by a comma followed by a space.
+
+
+3. Limiting the number of concatenated elements
+
+Query:
+
+``` sql
+SELECT groupConcat(Name, ', ', 2) FROM Employees;
+```
+
+Result:
+
+``` text
+John, Jane
+```
+
+This query limits the output to the first two names, even though there are more names in the table.
diff --git a/tests/fuzz/dictionaries/functions.dict b/tests/fuzz/dictionaries/functions.dict
index ec7f8017fb2..6f2a88c22fa 100644
--- a/tests/fuzz/dictionaries/functions.dict
+++ b/tests/fuzz/dictionaries/functions.dict
@@ -1588,6 +1588,7 @@
 "groupBitmapXorResample"
 "groupBitmapXorSimpleState"
 "groupBitmapXorState"
+"groupConcat"
 "groupUniqArray"
 "groupUniqArrayArgMax"
 "groupUniqArrayArgMin"
diff --git a/tests/integration/test_accept_invalid_certificate/configs/ssl_config_strict.xml b/tests/integration/test_accept_invalid_certificate/configs/ssl_config_strict.xml
new file mode 100644
index 00000000000..a4383a77ac4
--- /dev/null
+++ b/tests/integration/test_accept_invalid_certificate/configs/ssl_config_strict.xml
@@ -0,0 +1,17 @@
+<clickhouse>
+    <!-- Native interface with TLS.
+         You have to configure certificate to enable this interface.
+         See the openSSL section below.
+    -->
+    <tcp_port_secure>9440</tcp_port_secure>
+
+    <!-- Used with https_port and tcp_port_secure. Full ssl options list: https://github.com/ClickHouse-Extras/poco/blob/master/NetSSL_OpenSSL/include/Poco/Net/SSLManager.h#L71 -->
+    <openSSL replace="replace">
+        <server> <!-- Used for https server AND secure tcp port -->
+            <certificateFile>/etc/clickhouse-server/config.d/self-cert.pem</certificateFile>
+            <privateKeyFile>/etc/clickhouse-server/config.d/self-key.pem</privateKeyFile>
+            <caConfig>/etc/clickhouse-server/config.d/ca-cert.pem</caConfig>
+            <verificationMode>strict</verificationMode>
+        </server>
+    </openSSL>
+</clickhouse>
diff --git a/tests/integration/test_accept_invalid_certificate/test.py b/tests/integration/test_accept_invalid_certificate/test.py
index 87229d75f90..f43e9e6140a 100644
--- a/tests/integration/test_accept_invalid_certificate/test.py
+++ b/tests/integration/test_accept_invalid_certificate/test.py
@@ -17,6 +17,19 @@ instance = cluster.add_instance(
         "certs/self-cert.pem",
         "certs/ca-cert.pem",
     ],
+    with_zookeeper=False,
+)
+
+
+node1 = cluster.add_instance(
+    "node1",
+    main_configs=[
+        "configs/ssl_config_strict.xml",
+        "certs/self-key.pem",
+        "certs/self-cert.pem",
+        "certs/ca-cert.pem",
+    ],
+    with_zookeeper=False,
 )
 
 
@@ -90,3 +103,25 @@ def test_connection_accept():
         )
         == "1\n"
     )
+
+
+def test_strict_reject():
+    with pytest.raises(Exception) as err:
+        execute_query_native(node1, "SELECT 1", "<clickhouse></clickhouse>")
+    assert "certificate verify failed" in str(err.value)
+
+
+def test_strict_reject_with_config():
+    with pytest.raises(Exception) as err:
+        execute_query_native(node1, "SELECT 1", config_accept)
+    assert "alert certificate required" in str(err.value)
+
+
+def test_strict_connection_reject():
+    with pytest.raises(Exception) as err:
+        execute_query_native(
+            node1,
+            "SELECT 1",
+            config_connection_accept.format(ip_address=f"{instance.ip_address}"),
+        )
+    assert "certificate verify failed" in str(err.value)
diff --git a/utils/check-style/aspell-ignore/en/aspell-dict.txt b/utils/check-style/aspell-ignore/en/aspell-dict.txt
index b21ae0764c6..d82b70cfdb4 100644
--- a/utils/check-style/aspell-ignore/en/aspell-dict.txt
+++ b/utils/check-style/aspell-ignore/en/aspell-dict.txt
@@ -1733,6 +1733,7 @@ groupBitmap
 groupBitmapAnd
 groupBitmapOr
 groupBitmapXor
+groupConcat
 groupUniqArray
 grouparray
 grouparrayinsertat
@@ -1749,6 +1750,7 @@ groupbitmapor
 groupbitmapxor
 groupbitor
 groupbitxor
+groupconcat
 groupuniqarray
 grpc
 grpcio