diff --git a/pySim/transport/pcsc.py b/pySim/transport/pcsc.py
index c92a3ba2..21d3ce4d 100644
--- a/pySim/transport/pcsc.py
+++ b/pySim/transport/pcsc.py
@@ -26,6 +26,7 @@ from smartcard.CardRequest import CardRequest
 from smartcard.Exceptions import NoCardException, CardRequestTimeoutException, CardConnectionException
 from smartcard.System import readers
 from smartcard.ExclusiveConnectCardConnection import ExclusiveConnectCardConnection
+from smartcard.ATR import ATR
 
 from osmocom.utils import h2i, i2h, Hexstr
 
@@ -84,18 +85,21 @@ class PcscSimLink(LinkBaseTpdu):
             self.disconnect()
 
             # Make card connection and select a suitable communication protocol
+            # (Even though pyscard provides an automatic protocol selection, we will make an independent decision
+            #  based on the ATR. There are two reasons for that:
+            #  1) In case a card supports T=0 and T=1, we perfer to use T=0.
+            #  2) The automatic protocol selection may be unreliabe on some platforms
+            #     see also: https://osmocom.org/issues/6952)
             self._con.connect()
-            supported_protocols = self._con.getProtocol();
-            self.disconnect()
-            if (supported_protocols & CardConnection.T0_protocol):
-                protocol =  CardConnection.T0_protocol
+            atr = ATR(self._con.getATR())
+            if atr.isT0Supported():
+                self._con.setProtocol(CardConnection.T0_protocol)
                 self.set_tpdu_format(0)
-            elif (supported_protocols & CardConnection.T1_protocol):
-                protocol = CardConnection.T1_protocol
+            elif atr.isT1Supported():
+                self._con.setProtocol(CardConnection.T1_protocol)
                 self.set_tpdu_format(1)
             else:
                 raise ReaderError('Unsupported card protocol')
-            self._con.connect(protocol)
         except CardConnectionException as exc:
             raise ProtocolError() from exc
         except NoCardException as exc: