diff --git a/copyparty/__main__.py b/copyparty/__main__.py
index 111a6c32..f0f49872 100644
--- a/copyparty/__main__.py
+++ b/copyparty/__main__.py
@@ -20,7 +20,7 @@ import time
 import traceback
 from textwrap import dedent
 
-from .__init__ import ANYWIN, PY2, VT100, WINDOWS, E, unicode, CORES
+from .__init__ import ANYWIN, CORES, PY2, VT100, WINDOWS, E, unicode
 from .__version__ import CODENAME, S_BUILD_DT, S_VERSION
 from .authsrv import re_vol
 from .svchub import SvcHub
diff --git a/copyparty/broker_mp.py b/copyparty/broker_mp.py
index df4f8c26..1727e9c1 100644
--- a/copyparty/broker_mp.py
+++ b/copyparty/broker_mp.py
@@ -6,7 +6,7 @@ import time
 
 import queue
 
-from .__init__ import TYPE_CHECKING, CORES
+from .__init__ import CORES, TYPE_CHECKING
 from .broker_mpw import MpWorker
 from .broker_util import try_exec
 from .util import mp
diff --git a/copyparty/httpconn.py b/copyparty/httpconn.py
index 7c6c168b..448ee203 100644
--- a/copyparty/httpconn.py
+++ b/copyparty/httpconn.py
@@ -23,6 +23,7 @@ from .mtag import HAVE_FFMPEG
 from .th_cli import ThumbCli
 from .th_srv import HAVE_PIL, HAVE_VIPS
 from .u2idx import U2idx
+from .util import shut_socket
 
 try:
     from typing import Optional, Pattern, Union
@@ -72,8 +73,7 @@ class HttpConn(object):
     def shutdown(self) -> None:
         self.stopping = True
         try:
-            self.s.shutdown(socket.SHUT_RDWR)
-            self.s.close()
+            shut_socket(self.log, self.s, 1)
         except:
             pass
 
diff --git a/copyparty/httpsrv.py b/copyparty/httpsrv.py
index 3a35099a..cbd2defd 100644
--- a/copyparty/httpsrv.py
+++ b/copyparty/httpsrv.py
@@ -31,7 +31,7 @@ except ImportError:
 from .__init__ import MACOS, TYPE_CHECKING, E
 from .bos import bos
 from .httpconn import HttpConn
-from .util import FHC, min_ex, spack, start_log_thrs, start_stackmon
+from .util import FHC, min_ex, shut_socket, spack, start_log_thrs, start_stackmon
 
 if TYPE_CHECKING:
     from .broker_util import BrokerCli
@@ -55,6 +55,9 @@ class HttpSrv(object):
         self.log = broker.log
         self.asrv = broker.asrv
 
+        # redefine in case of multiprocessing
+        socket.setdefaulttimeout(120)
+
         nsuf = "-n{}-i{:x}".format(nid, os.getpid()) if nid else ""
 
         self.name = "hsrv" + nsuf
@@ -293,8 +296,6 @@ class HttpSrv(object):
 
     def thr_client(self, sck: socket.socket, addr: tuple[str, int]) -> None:
         """thread managing one tcp client"""
-        sck.settimeout(120)
-
         cli = HttpConn(sck, addr, self)
         with self.mutex:
             self.clients.add(cli)
@@ -321,8 +322,7 @@ class HttpSrv(object):
 
             try:
                 fno = sck.fileno()
-                sck.shutdown(socket.SHUT_RDWR)
-                sck.close()
+                shut_socket(cli.log, sck)
             except (OSError, socket.error) as ex:
                 if not MACOS:
                     self.log(
diff --git a/copyparty/tcpsrv.py b/copyparty/tcpsrv.py
index 4badc02e..28a87538 100644
--- a/copyparty/tcpsrv.py
+++ b/copyparty/tcpsrv.py
@@ -24,8 +24,10 @@ class TcpSrv(object):
         self.args = hub.args
         self.log = hub.log
 
-        self.stopping = False
+        # mp-safe since issue6056
+        socket.setdefaulttimeout(120)
 
+        self.stopping = False
         self.srv: list[socket.socket] = []
         self.nsrv = 0
         ok: dict[str, list[int]] = {}
@@ -112,6 +114,7 @@ class TcpSrv(object):
         srv = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
         srv.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
         srv.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
+        srv.settimeout(None)  # < does not inherit, ^ does
         try:
             srv.bind((ip, port))
             self.srv.append(srv)
diff --git a/copyparty/util.py b/copyparty/util.py
index 96b65ef9..4eaf9cd1 100644
--- a/copyparty/util.py
+++ b/copyparty/util.py
@@ -24,12 +24,14 @@ from datetime import datetime
 
 from queue import Queue
 
-from .__init__ import ANYWIN, PY2, TYPE_CHECKING, VT100, WINDOWS
+from .__init__ import ANYWIN, MACOS, PY2, TYPE_CHECKING, VT100, WINDOWS
 from .__version__ import S_BUILD_DT, S_VERSION
 from .stolen import surrogateescape
 
 try:
     import ctypes
+    import fcntl
+    import termios
 except:
     pass
 
@@ -1440,6 +1442,48 @@ def get_df(abspath: str) -> tuple[Optional[int], Optional[int]]:
         return (None, None)
 
 
+if not ANYWIN and not MACOS:
+
+    def siocoutq(sck: socket.socket) -> int:
+        # SIOCOUTQ^sockios.h == TIOCOUTQ^ioctl.h
+        try:
+            zb = fcntl.ioctl(sck.fileno(), termios.TIOCOUTQ, b"AAAA")
+            return sunpack(b"I", zb)[0]  # type: ignore
+        except:
+            return 1
+
+else:
+    # macos: getsockopt(fd, SOL_SOCKET, SO_NWRITE, ...)
+    # windows: TcpConnectionEstatsSendBuff
+
+    def siocoutq(sck: socket.socket) -> int:
+        return 1
+
+
+def shut_socket(log: "NamedLogger", sck: socket.socket, timeout: int = 3) -> None:
+    t0 = time.time()
+    try:
+        sck.settimeout(timeout)
+        sck.shutdown(socket.SHUT_WR)
+        try:
+            while time.time() - t0 < timeout:
+                if not siocoutq(sck):
+                    # kernel says tx queue empty, we good
+                    break
+
+                # on windows in particular, drain rx until client shuts
+                if not sck.recv(32 * 1024):
+                    break
+        except:
+            pass
+    finally:
+        td = time.time() - t0
+        if td >= 1:
+            log("shut() in {:.3f} sec".format(td), "1;30")
+
+        sck.close()
+
+
 def read_socket(sr: Unrecv, total_size: int) -> Generator[bytes, None, None]:
     remains = total_size
     while remains > 0:
@@ -2030,10 +2074,7 @@ def termsize() -> tuple[int, int]:
 
     def ioctl_GWINSZ(fd: int) -> Optional[tuple[int, int]]:
         try:
-            import fcntl
-            import termios
-
-            cr = struct.unpack("hh", fcntl.ioctl(fd, termios.TIOCGWINSZ, b"1234"))
+            cr = sunpack(b"hh", fcntl.ioctl(fd, termios.TIOCGWINSZ, b"AAAA"))
             return int(cr[1]), int(cr[0])
         except:
             return None