diff --git a/api-openbis-python3-pybis/src/python/pybis/pybis.py b/api-openbis-python3-pybis/src/python/pybis/pybis.py
index a0b8674fe5814c616a81e54e7df497f10d1eb107..bba0900153ccd0457abe5425ff43035bbf7ac8f8 100644
--- a/api-openbis-python3-pybis/src/python/pybis/pybis.py
+++ b/api-openbis-python3-pybis/src/python/pybis/pybis.py
@@ -1286,6 +1286,7 @@ class Openbis:
                 "Certificate validation failed. Use o=Openbis(url, verify_certificates=False) if you are using self-signed certificates."
             ) from exc
         except requests.ConnectionError as exc:
+            print(f"EXCEPTION:{exc}")
             raise requests.ConnectionError(
                 "Could not connecto to the openBIS server. Please check your internet connection, the specified hostname and port."
             ) from exc