Fix Issue 113 (#114)

* Fix Issue 113: setting exception handler for UniconAuthenticationError when validating credentials.

* black formatting fix

* black formatting fix

* black formatting fix

* black formatting fix

* Update CHANGELOG.md

---------

Co-authored-by: tzarski0 <92273798+tzarski0@users.noreply.github.com>

Author: llopezme-cisco

CHANGELOG.md

@@ -1,3 +1,7 @@
+# Catalyst SD-WAN Lab 2.1.3 [unreleased]
+
+- Fix issue where backup task might fail with generic traceback if SD-WAN Edge uses custom credentials
+
 # Catalyst SD-WAN Lab 2.1.2 [Jul 28, 2025]
 
 - Update minimum versions of aiohttp, cisco-sdwan, urllib3 and virl2-client packages

catalyst_sdwan_lab/tasks/backup.py

@@ -35,7 +35,10 @@ def validate_credentials(pylab: ClPyats, node_label: str) -> bool:
     try:
         pylab.run_command(node_label, "show version")
         return True
-    except unicon.core.errors.ConnectionError as conn_err:
+    except (
+        unicon.core.errors.UniconAuthenticationError,
+        unicon.core.errors.ConnectionError,
+    ) as conn_err:
         current_exception = conn_err
         # Loop to inspect the chain of causes
         while current_exception:
@@ -44,7 +47,7 @@ def validate_credentials(pylab: ClPyats, node_label: str) -> bool:
                 unicon.core.errors.UniconAuthenticationError,
             ) or isinstance(
                 current_exception,
-                unicon.core.errors.CredentialsExhaustedError,
+                unicon.core.errors.ConnectionError,
             ):
                 return False
             # Move to the next cause in the chain
@@ -107,7 +110,7 @@ def check_pyats_device_connectivity(
                 return [personality, node_type, pylab]
             else:
                 exit(
-                    f"Could not login to {node_label} using admin username and default or SD-WAN Manager password."
+                    f"Could not login to {node_label} using admin username and default or SD-WAN Manager password. "
                     f"Please fix admin user password and rerun the script."
                 )
     except unicon.core.errors.ConnectionError as conn_err:
@@ -130,7 +133,7 @@ def check_pyats_device_connectivity(
                     return [personality, node_type, pylab]
                 else:
                     exit(
-                        f"Could not login to {node_label} using admin username and default or SD-WAN Manager password."
+                        f"Could not login to {node_label} using admin username and default or SD-WAN Manager password. "
                         f"Please fix admin user password and rerun the script."
                     )
             # Move to the next cause in the chain