diff --git a/pulp/apis/__init__.py b/pulp/apis/__init__.py
index 41c3240f..5133a92a 100644
--- a/pulp/apis/__init__.py
+++ b/pulp/apis/__init__.py
@@ -151,7 +151,7 @@ def listSolvers(onlyAvailable=False):
     """
     result = []
     for s in _all_solvers:
-        solver = s()
+        solver = s(msg=False)
         if (not onlyAvailable) or solver.available():
             result.append(solver.name)
         del solver
diff --git a/pulp/apis/copt_api.py b/pulp/apis/copt_api.py
index 71183480..9d55e30a 100644
--- a/pulp/apis/copt_api.py
+++ b/pulp/apis/copt_api.py
@@ -909,10 +909,10 @@ def __init__(
                 else:
                     # linux and mac should have /dev/null
                     devnull = open("/dev/null", "w")
-                os.dup2(devnull.fileno(), 1)
+                os.dup2(devnull.fileno(), sys.stdout.fileno())
                 self.coptenv = coptpy.Envr()
                 self.coptmdl = self.coptenv.createModel()
-                os.dup2(oldstdout_fno, 1)
+                os.dup2(oldstdout_fno, sys.stdout.fileno())
             else:
                 self.coptenv = coptpy.Envr()
                 self.coptmdl = self.coptenv.createModel()