diff --git a/hwilib/devices/ckcc/client.py b/hwilib/devices/ckcc/client.py
index f550e5179..3159cdbda 100644
--- a/hwilib/devices/ckcc/client.py
+++ b/hwilib/devices/ckcc/client.py
@@ -8,7 +8,7 @@
 #
 #   - ec_mult, ec_setup, aes_setup, mitm_verify
 #
-import hid, sys, os
+import hid, sys, os, platform
 from binascii import b2a_hex, a2b_hex
 from hashlib import sha256
 from .protocol import CCProtocolPacker, CCProtocolUnpacker, CCProtoError, MAX_MSG_LEN, MAX_BLK_LEN
@@ -27,6 +27,8 @@ def __init__(self, sn=None, dev=None, encrypt=True):
         self.is_simulator = False
 
         if not dev and sn and '/' in sn:
+            if platform.system() == 'Windows':
+                raise RuntimeError("Cannot connect to simulator. Is it running?")
             dev = UnixSimulatorPipe(sn)
             found = 'simulator'
             self.is_simulator = True
diff --git a/hwilib/devices/trezorlib/transport/webusb.py b/hwilib/devices/trezorlib/transport/webusb.py
index a4c2840ee..61d14e4a2 100644
--- a/hwilib/devices/trezorlib/transport/webusb.py
+++ b/hwilib/devices/trezorlib/transport/webusb.py
@@ -126,7 +126,7 @@ def enumerate(cls) -> Iterable["WebUsbTransport"]:
                 # non-functional.
                 dev.getProduct()
                 devices.append(WebUsbTransport(dev))
-            except usb1.USBErrorNotSupported:
+            except:
                 pass
         return devices