fix: (migrated PR 4094): fix socket.gethostbyaddr(ip) error when no reverse DNS available.

doc/changelog.d/4095.miscellaneous.md

@@ -0,0 +1 @@
+Fix: (migrated pr 4094): fix socket.gethostbyaddr(ip) error when no reverse dns available.

src/ansys/mapdl/core/mapdl_grpc.py

@@ -31,7 +31,6 @@
 import pathlib
 import re
 import shutil
-import socket
 
 # Subprocess is needed to start the backend. But
 # the input is controlled by the library. Excluding bandit check.
@@ -87,8 +86,8 @@
 from ansys.mapdl.core.mapdl_types import KwargDict, MapdlFloat, MapdlInt
 from ansys.mapdl.core.misc import (
     check_valid_ip,
+    get_ip_hostname,
     last_created,
-    only_numbers_and_dots,
     random_string,
     run_as,
     supress_logging,
@@ -373,18 +372,9 @@ def __init__(
         if ip is None:
             ip = start_parm.pop("ip", None) or "127.0.0.1"
 
-        # setting hostname
-        if not only_numbers_and_dots(ip):
-            # it is a hostname
-            self._hostname = ip
-            ip = socket.gethostbyname(ip)
-        else:
-            # it is an IP
-            self._hostname = (
-                "localhost"
-                if ip in ["127.0.0.1", "127.0.1.1", "localhost"]
-                else socket.gethostbyaddr(ip)[0]
-            )
+        # setting hostname and ip
+        ip, hostname = get_ip_hostname(ip)
+        self._hostname = hostname
 
         check_valid_ip(ip)
         self._ip: str = ip

src/ansys/mapdl/core/misc.py

@@ -666,3 +666,23 @@
         return f
 
     return deco
+
+
+def get_ip_hostname(ip: str) -> Tuple[str, str]:
+    """Get ip and hostname"""
+    if not only_numbers_and_dots(ip):
+        # it is a hostname
+        hostname = ip
+        ip = socket.gethostbyname(ip)
+    else:
+        # it is an IP
+        if ip in ["127.0.0.1", "127.0.1.1", "localhost"]:
+            hostname = "localhost"
+        else:
+            try:
+                hostname = socket.gethostbyaddr(ip)[0]
+            except OSError:
+                # If the IP address does not resolve to a hostname, use the IP
+                hostname = ip
+
+    return ip, hostname