diff --git a/gns3server/controller/project.py b/gns3server/controller/project.py
index e548d34e6..501e9f4e5 100644
--- a/gns3server/controller/project.py
+++ b/gns3server/controller/project.py
@@ -38,6 +38,7 @@ from ..config import Config
 from ..utils.application_id import get_next_application_id, is_iol_runner_environment
 from ..utils.asyncio import aiozipstream, locking, wait_run_in_executor
 from ..utils.asyncio.pool import Pool
+from ..utils.hostname import template_name_to_node_name
 from ..utils.packet_filter_validation import validate_bpf_syntax
 from ..utils.path import check_path_allowed, get_default_project_directory
 from .compute import ComputeError
@@ -622,7 +623,7 @@ class Project:
         log.info(f'Creating node from template "{template_name}" on compute "{compute.name}" [{compute.id}]')
         default_name_format = template.pop("default_name_format", "{name}-{0}")
         if name is None:
-            name = default_name_format.replace("{name}", template_name)
+            name = default_name_format.replace("{name}", template_name_to_node_name(template_name, node_type))
         # the appliance metadata stays template level: only the default
         # credentials are seeded on the node (where they can be overridden)
         appliance_metadata = template.pop("appliance_metadata", None) or {}
diff --git a/gns3server/utils/hostname.py b/gns3server/utils/hostname.py
index bb9291e3f..e2dac7750 100644
--- a/gns3server/utils/hostname.py
+++ b/gns3server/utils/hostname.py
@@ -110,3 +110,22 @@ def to_rfc1123_hostname(name: str) -> str:
     name = name[:253]
 
     return name
+
+
+def template_name_to_node_name(name: str, node_type: str) -> str:
+    """
+    Convert a template name to the base of the names of the nodes created from it.
+
+    Spaces are removed. For the node types whose names the compute validates as
+    hostnames, the other invalid characters (e.g. "+" in a model name) are replaced
+    by hyphens: RFC 1123 for Qemu and Docker, IOS for Dynamips and IOU.
+    """
+
+    name = name.replace(" ", "")
+    if node_type in ("qemu", "docker"):
+        name = re.sub(r"[^a-zA-Z0-9.-]", "-", name)
+    elif node_type in ("dynamips", "iou"):
+        name = re.sub(r"[^a-zA-Z0-9-]", "-", name)
+    else:
+        return name
+    return name.strip("-.") or node_type
diff --git a/tests/controller/test_project.py b/tests/controller/test_project.py
index b41c7cb53..9ea1c6726 100644
--- a/tests/controller/test_project.py
+++ b/tests/controller/test_project.py
@@ -253,6 +253,35 @@ async def test_add_node_from_template_seeds_default_credentials(controller):
     assert "default_password" not in node.properties
 
 
+@pytest.mark.asyncio
+async def test_add_node_from_template_name_invalid_in_hostname(controller):
+    """
+    A template name with characters invalid in a hostname (e.g. "+" in a model name)
+    gives node names the compute accepts.
+    """
+
+    compute = MagicMock()
+    compute.id = "local"
+    controller._computes["local"] = compute
+    project = Project(controller=controller, name="Test")
+    project.emit_notification = MagicMock()
+
+    response = MagicMock()
+    response.json = {"console": 2048}
+    compute.post = AsyncioMagicMock(return_value=response)
+
+    template = {
+        "name": "MikroTik CCR1072-1G-8S+",
+        "template_type": "qemu",
+        "compute_id": "local",
+        "default_name_format": "{name}-{0}",
+        "properties": {},
+    }
+
+    node = await project.add_node_from_template(template)
+    assert node.name == "MikroTikCCR1072-1G-8S-1"
+
+
 @pytest.mark.asyncio
 async def test_add_node_non_local(controller):
     """
diff --git a/tests/utils/test_hostname.py b/tests/utils/test_hostname.py
index e802a40a5..3648a6825 100644
--- a/tests/utils/test_hostname.py
+++ b/tests/utils/test_hostname.py
@@ -14,6 +14,8 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+import pytest
+
 from gns3server.utils import hostname
 
 
@@ -118,3 +120,20 @@ def test_rfc1123_conversion_hostname_with_all_numeric_tld_replaced():
 
 def rfc1123_hostname_with_multiple_consecutive_invalid_characters():
     assert hostname.to_rfc1123_hostname("hostname!!!.example..com") == "hostname---.example.com"
+
+
+@pytest.mark.parametrize(
+    "name,node_type,expected",
+    [
+        ("MikroTik CCR1072-1G-8S+", "qemu", "MikroTikCCR1072-1G-8S"),
+        ("MikroTik RB450G", "qemu", "MikroTikRB450G"),
+        ("Cisco IOSv 15.9", "qemu", "CiscoIOSv15.9"),
+        ("ubuntu:22.04", "docker", "ubuntu-22.04"),
+        ("IOU L2 15.2", "iou", "IOUL215-2"),
+        ("c7200+", "dynamips", "c7200"),
+        ("PC 1+", "vpcs", "PC1+"),
+        ("+++", "qemu", "qemu"),
+    ],
+)
+def test_template_name_to_node_name(name, node_type, expected):
+    assert hostname.template_name_to_node_name(name, node_type) == expected