diff --git a/core/ssh_client.py b/core/ssh_client.py
index deb6e68..f0f83c7 100644
--- a/core/ssh_client.py
+++ b/core/ssh_client.py
@@ -7,6 +7,7 @@ import platform
 import socket
 import threading
 import time
+import hashlib
 import paramiko
 from core.logger import log
 
@@ -47,7 +48,8 @@ def _connect_client(server: dict, key_path: str, timeout: int = 15) -> paramiko.
             client.connect(**kwargs)
             transport = client.get_transport()
             if transport is not None:
-                transport.set_keepalive(30)
+                transport.set_keepalive(15)
+                transport.default_window_size = 4 * 1024 * 1024
             return client
         except paramiko.AuthenticationException:
             log.debug(f"Key auth failed for {server.get('alias', '?')}, trying password")
@@ -73,7 +75,8 @@ def _connect_client(server: dict, key_path: str, timeout: int = 15) -> paramiko.
         client.connect(**kwargs)
         transport = client.get_transport()
         if transport is not None:
-            transport.set_keepalive(30)
+            transport.set_keepalive(15)
+            transport.default_window_size = 4 * 1024 * 1024
         return client
 
     raise Exception(f"No auth method for {server.get('alias', 'unknown')}")
@@ -238,21 +241,94 @@ class SSHClientWrapper:
                         pass
             client.close()
 
-    def upload(self, local_path: str, remote_path: str, progress_cb=None):
-        client = self.connect()
-        try:
-            sftp = client.open_sftp()
-            if progress_cb:
-                sftp.put(local_path, remote_path, callback=progress_cb)
-            else:
-                sftp.put(local_path, remote_path)
+    def upload(self, local_path: str, remote_path: str, progress_cb=None,
+               max_retries=3):
+        file_size = os.path.getsize(local_path)
+        use_resume = file_size > 10 * 1024 * 1024
+        tmp_path = (remote_path + ".part") if use_resume else remote_path
+
+        for attempt in range(1, max_retries + 1):
+            client = self.connect()
             try:
-                sftp.chmod(remote_path, 0o664)
-            except OSError:
-                pass  # Windows OpenSSH doesn't support chmod
-            sftp.close()
-        finally:
-            client.close()
+                sftp = client.open_sftp()
+
+                if use_resume:
+                    remote_offset = 0
+                    try:
+                        remote_offset = sftp.stat(tmp_path).st_size
+                        if remote_offset > file_size:
+                            sftp.remove(tmp_path)
+                            remote_offset = 0
+                    except (FileNotFoundError, IOError):
+                        remote_offset = 0
+
+                    with open(local_path, 'rb') as f:
+                        f.seek(remote_offset)
+                        if remote_offset > 0:
+                            rf = sftp.open(tmp_path, 'r+b')
+                            rf.seek(remote_offset)
+                        else:
+                            rf = sftp.open(tmp_path, 'wb')
+                        rf.set_pipelined(True)
+                        try:
+                            transferred = remote_offset
+                            while transferred < file_size:
+                                data = f.read(256 * 1024)
+                                if not data:
+                                    break
+                                rf.write(data)
+                                transferred += len(data)
+                                if progress_cb:
+                                    progress_cb(transferred, file_size)
+                        finally:
+                            rf.close()
+
+                    if sftp.stat(tmp_path).st_size != file_size:
+                        raise IOError("Upload size mismatch")
+
+                    # SHA256 verification via SFTP readback
+                    local_hash = hashlib.sha256()
+                    with open(local_path, 'rb') as f:
+                        for chunk in iter(lambda: f.read(1024 * 1024), b''):
+                            local_hash.update(chunk)
+                    remote_hash = hashlib.sha256()
+                    with sftp.open(tmp_path, 'rb') as rf:
+                        while True:
+                            chunk = rf.read(1024 * 1024)
+                            if not chunk:
+                                break
+                            remote_hash.update(chunk)
+                    if local_hash.hexdigest() != remote_hash.hexdigest():
+                        sftp.remove(tmp_path)
+                        raise IOError("SHA256 mismatch after upload")
+
+                    try:
+                        sftp.remove(remote_path)
+                    except (FileNotFoundError, IOError):
+                        pass
+                    sftp.rename(tmp_path, remote_path)
+                else:
+                    if progress_cb:
+                        sftp.put(local_path, remote_path, callback=progress_cb)
+                    else:
+                        sftp.put(local_path, remote_path)
+
+                try:
+                    sftp.chmod(remote_path, 0o664)
+                except OSError:
+                    pass
+                sftp.close()
+                return  # Success
+
+            except (EOFError, TimeoutError, OSError,
+                    paramiko.SSHException) as e:
+                log.warning(f"Upload attempt {attempt}/{max_retries}: {e}")
+                if attempt < max_retries:
+                    time.sleep(2 ** attempt)
+                else:
+                    raise
+            finally:
+                client.close()
 
     def download(self, remote_path: str, local_path: str, progress_cb=None):
         client = self.connect()
@@ -385,11 +461,83 @@ class SFTPSession:
         self._sftp.rename(old, new)
 
     def upload(self, local_path: str, remote_path: str, progress_cb=None):
-        if progress_cb:
+        file_size = os.path.getsize(local_path)
+        if file_size > 10 * 1024 * 1024:  # >10MB: chunked
+            self._upload_chunked(local_path, remote_path, file_size, progress_cb)
+        elif progress_cb:
             self._sftp.put(local_path, remote_path, callback=progress_cb)
         else:
             self._sftp.put(local_path, remote_path)
 
+    def _upload_chunked(self, local_path, remote_path, file_size, progress_cb):
+        """Chunked upload with resume, .part, atomic rename and SHA256 verification."""
+        tmp_path = remote_path + ".part"
+        remote_offset = 0
+        try:
+            remote_offset = self._sftp.stat(tmp_path).st_size
+            if remote_offset > file_size:
+                self._sftp.remove(tmp_path)
+                remote_offset = 0
+        except (FileNotFoundError, IOError):
+            remote_offset = 0
+
+        with open(local_path, 'rb') as f:
+            f.seek(remote_offset)
+            if remote_offset > 0:
+                rf = self._sftp.open(tmp_path, 'r+b')
+                rf.seek(remote_offset)
+            else:
+                rf = self._sftp.open(tmp_path, 'wb')
+            rf.set_pipelined(True)
+            try:
+                transferred = remote_offset
+                while transferred < file_size:
+                    data = f.read(256 * 1024)
+                    if not data:
+                        break
+                    rf.write(data)
+                    transferred += len(data)
+                    if progress_cb:
+                        progress_cb(transferred, file_size)
+            finally:
+                rf.close()
+
+        # Validate: size
+        if self._sftp.stat(tmp_path).st_size != file_size:
+            raise IOError("Upload size mismatch")
+
+        # Validate: SHA256 via SFTP readback
+        local_hash = hashlib.sha256()
+        with open(local_path, 'rb') as f:
+            for chunk in iter(lambda: f.read(1024 * 1024), b''):
+                local_hash.update(chunk)
+
+        remote_hash = hashlib.sha256()
+        with self._sftp.open(tmp_path, 'rb') as rf:
+            while True:
+                chunk = rf.read(1024 * 1024)
+                if not chunk:
+                    break
+                remote_hash.update(chunk)
+
+        if local_hash.hexdigest() != remote_hash.hexdigest():
+            self._sftp.remove(tmp_path)
+            raise IOError(
+                f"SHA256 mismatch! local={local_hash.hexdigest()[:16]}... "
+                f"remote={remote_hash.hexdigest()[:16]}..."
+            )
+
+        # Atomic rename
+        try:
+            self._sftp.remove(remote_path)
+        except (FileNotFoundError, IOError):
+            pass
+        self._sftp.rename(tmp_path, remote_path)
+        try:
+            self._sftp.chmod(remote_path, 0o664)
+        except OSError:
+            pass
+
     def download(self, remote_path: str, local_path: str, progress_cb=None):
         if progress_cb:
             self._sftp.get(remote_path, local_path, callback=progress_cb)
diff --git a/releases/ServerManager-v1.8.65-win-x64.exe b/releases/ServerManager-v1.8.65-win-x64.exe
deleted file mode 100644
index 3bf5b92..0000000
Binary files a/releases/ServerManager-v1.8.65-win-x64.exe and /dev/null differ
diff --git a/releases/ServerManager-v1.8.67-linux-x64 b/releases/ServerManager-v1.8.67-linux-x64
deleted file mode 100755
index 28db088..0000000
Binary files a/releases/ServerManager-v1.8.67-linux-x64 and /dev/null differ
diff --git a/releases/ServerManager-v1.8.68-linux-x64 b/releases/ServerManager-v1.8.68-linux-x64
deleted file mode 100644
index f92f2f0..0000000
Binary files a/releases/ServerManager-v1.8.68-linux-x64 and /dev/null differ
diff --git a/releases/ServerManager-v1.8.66-win-x64.exe b/releases/ServerManager-v1.8.72-win-x64.exe
similarity index 97%
rename from releases/ServerManager-v1.8.66-win-x64.exe
rename to releases/ServerManager-v1.8.72-win-x64.exe
index 058975d..42b1236 100644
Binary files a/releases/ServerManager-v1.8.66-win-x64.exe and b/releases/ServerManager-v1.8.72-win-x64.exe differ
diff --git a/releases/ServerManager-v1.8.63-win-x64.exe b/releases/ServerManager-v1.8.73-win-x64.exe
similarity index 97%
rename from releases/ServerManager-v1.8.63-win-x64.exe
rename to releases/ServerManager-v1.8.73-win-x64.exe
index e8082aa..1af46a9 100644
Binary files a/releases/ServerManager-v1.8.63-win-x64.exe and b/releases/ServerManager-v1.8.73-win-x64.exe differ
diff --git a/tools/skill-ssh.md b/tools/skill-ssh.md
index ee3de10..0f2dc4f 100644
--- a/tools/skill-ssh.md
+++ b/tools/skill-ssh.md
@@ -201,7 +201,14 @@ unset SSH_ASKPASS && unset DISPLAY && ssh ALIAS "command"
 
 ## КРИТИЧНО — Передача файлов
 
-**ВСЕГДА используй `--upload` / `--download` для передачи файлов.** Это SFTP-протокол: надёжный, поддерживает любые размеры, показывает прогресс.
+**ВСЕГДА используй `--upload` / `--download` для передачи файлов.** Это SFTP-протокол с автоматическими фичами:
+
+- **Файлы >10MB:** chunked upload с resume — при обрыве продолжит с того места
+- **Retry:** до 5 попыток с exponential backoff при сетевых ошибках
+- **SHA256 верификация:** автоматическая проверка целостности после загрузки
+- **Atomic rename:** запись в .part файл → проверка → переименование
+- **Keepalive:** SSH keepalive каждые 15 секунд — не обрывается NAT/роутером
+- **Прогресс:** 25/50/75% для файлов >1MB
 
 ```bash
 # Загрузить файл на сервер (SFTP)
diff --git a/tools/ssh.py b/tools/ssh.py
index 508b18f..8733884 100644
--- a/tools/ssh.py
+++ b/tools/ssh.py
@@ -45,6 +45,7 @@ import sys
 import os
 import json
 import time
+import hashlib
 import paramiko
 
 # Shared config — same file used by ServerManager GUI
@@ -118,11 +119,18 @@ def get_client(server: dict) -> paramiko.SSHClient:
         "banner_timeout": 15,
     }
 
+    def _harden_transport(c):
+        transport = c.get_transport()
+        if transport is not None:
+            transport.set_keepalive(15)
+            transport.default_window_size = 4 * 1024 * 1024
+
     # Try key first
     if os.path.exists(SSH_KEY_PATH):
         try:
             kwargs["key_filename"] = SSH_KEY_PATH
             client.connect(**kwargs)
+            _harden_transport(client)
             return client
         except Exception:
             del kwargs["key_filename"]
@@ -136,6 +144,7 @@ def get_client(server: dict) -> paramiko.SSHClient:
         kwargs["look_for_keys"] = False
         kwargs["allow_agent"] = False
         client.connect(**kwargs)
+        _harden_transport(client)
         return client
 
     raise Exception(f"No auth method for {server['alias']}")
@@ -514,29 +523,194 @@ def _progress_cb(total_bytes: int):
     return callback
 
 
+RESUME_THRESHOLD = 10 * 1024 * 1024   # >10MB → chunked resume
+CHUNK_SIZE       = 256 * 1024          # 256KB per write
+MAX_RETRIES      = 5
+
+
+def _sha256_local(path: str) -> str:
+    """SHA256 hash of a local file."""
+    h = hashlib.sha256()
+    with open(path, 'rb') as f:
+        for chunk in iter(lambda: f.read(1024 * 1024), b''):
+            h.update(chunk)
+    return h.hexdigest()
+
+
+def _sha256_remote(client, remote_path: str, is_windows: bool = False) -> str | None:
+    """SHA256 hash of a remote file via exec.
+    Returns None if sha256sum is unavailable."""
+    if is_windows:
+        # SFTP path may start with / (e.g. /C:/Users/...) — strip for PowerShell
+        win_path = remote_path
+        if win_path.startswith('/') and len(win_path) > 2 and win_path[2] == ':':
+            win_path = win_path[1:]
+        escaped = win_path.replace('"', '`"')
+        cmd = f'powershell -Command "(Get-FileHash -Path \\"{escaped}\\" -Algorithm SHA256).Hash"'
+    else:
+        escaped = remote_path.replace("'", "'\\''")
+        cmd = (f"sha256sum '{escaped}' 2>/dev/null || "
+               f"shasum -a 256 '{escaped}' 2>/dev/null")
+    try:
+        stdin, stdout, stderr = client.exec_command(cmd, timeout=120)
+        output = stdout.read().decode().strip()
+        exit_code = stdout.channel.recv_exit_status()
+        if exit_code == 0 and output:
+            return output.split()[0].lower()
+    except Exception:
+        pass
+    return None
+
+
 def upload_file(server: dict, local_path: str, remote_path: str):
-    normalized_remote_path = _normalize_remote_path(remote_path)
+    normalized = _normalize_remote_path(remote_path)
     file_size = os.path.getsize(local_path)
+
+    if file_size > RESUME_THRESHOLD:
+        _upload_resumable(server, local_path, normalized, file_size)
+    else:
+        _upload_simple(server, local_path, normalized, file_size)
+
+
+def _upload_simple(server, local_path, remote_path, file_size):
+    """Simple upload for files <=10MB."""
     client = get_client(server)
     try:
         sftp = client.open_sftp()
         t0 = time.time()
-        sftp.put(local_path, normalized_remote_path, callback=_progress_cb(file_size))
+        sftp.put(local_path, remote_path, callback=_progress_cb(file_size))
         elapsed = time.time() - t0
         try:
-            sftp.chmod(normalized_remote_path, 0o664)
+            sftp.chmod(remote_path, 0o664)
         except OSError:
-            pass  # Windows OpenSSH doesn't support chmod
+            pass
         sftp.close()
-
-        info = f"{_fmt_size(file_size)}, {elapsed:.1f}s"
-        if file_size >= 1024 * 1024 and elapsed > 0:
-            speed = file_size / elapsed
-            info += f", {_fmt_size(int(speed))}/s"
-        print(f"OK: {local_path} -> {server['alias']}:{normalized_remote_path} ({info})")
+        _print_result(server, local_path, remote_path, file_size, elapsed)
     finally:
         client.close()
 
+
+def _upload_resumable(server, local_path, remote_path, file_size):
+    """Chunked upload with resume, retry, atomic rename and SHA256 verification."""
+    tmp_path = remote_path + ".part"
+    progress = _progress_cb(file_size)
+    is_windows = _is_windows_server(server)
+    t0 = time.time()
+
+    # Adaptive retries: more attempts for larger files (unstable links need resume)
+    max_retries = max(MAX_RETRIES, min(file_size // (10 * 1024 * 1024) + 3, 30))
+
+    for attempt in range(1, max_retries + 1):
+        client = None
+        sftp = None
+        try:
+            client = get_client(server)
+            sftp = client.open_sftp()
+
+            # How much is already uploaded?
+            remote_offset = 0
+            try:
+                remote_offset = sftp.stat(tmp_path).st_size
+                if remote_offset > file_size:
+                    sftp.remove(tmp_path)
+                    remote_offset = 0
+            except FileNotFoundError:
+                remote_offset = 0
+
+            if 0 < remote_offset < file_size:
+                print(f"Resume: {_fmt_size(remote_offset)}/{_fmt_size(file_size)} "
+                      f"({remote_offset * 100 // file_size}%)")
+
+            # Write remaining data
+            if remote_offset < file_size:
+                with open(local_path, 'rb') as f:
+                    f.seek(remote_offset)
+
+                    if remote_offset > 0:
+                        rf = sftp.open(tmp_path, 'r+b')
+                        rf.seek(remote_offset)
+                    else:
+                        rf = sftp.open(tmp_path, 'wb')
+
+                    rf.set_pipelined(True)
+                    try:
+                        transferred = remote_offset
+                        while transferred < file_size:
+                            data = f.read(CHUNK_SIZE)
+                            if not data:
+                                break
+                            rf.write(data)
+                            transferred += len(data)
+                            progress(transferred, file_size)
+                    finally:
+                        rf.close()
+
+            # === VALIDATE: size ===
+            actual = sftp.stat(tmp_path).st_size
+            if actual != file_size:
+                raise IOError(f"Size mismatch: expected {file_size}, got {actual}")
+
+            # === VALIDATE: SHA256 before rename (always, even if resumed) ===
+            print("Verifying SHA256...", end=" ", flush=True)
+            local_hash = _sha256_local(local_path)
+            remote_hash = _sha256_remote(client, tmp_path, is_windows)
+            if remote_hash is not None and local_hash != remote_hash:
+                print(f"MISMATCH on attempt {attempt}", file=sys.stderr)
+                sftp.remove(tmp_path)
+                if attempt < max_retries:
+                    continue  # Retry from scratch
+                else:
+                    raise IOError(
+                        f"CHECKSUM MISMATCH after {max_retries} attempts!\n"
+                        f"  local:  {local_hash}\n"
+                        f"  remote: {remote_hash}"
+                    )
+            elif remote_hash is not None:
+                print(f"OK ({local_hash[:16]}...)")
+            else:
+                print("SKIP (sha256sum unavailable)")
+
+            # Atomic rename: .part → final
+            try:
+                sftp.remove(remote_path)
+            except (FileNotFoundError, IOError):
+                pass
+            sftp.rename(tmp_path, remote_path)
+
+            try:
+                sftp.chmod(remote_path, 0o664)
+            except OSError:
+                pass
+
+            elapsed = time.time() - t0
+            _print_result(server, local_path, remote_path, file_size, elapsed)
+            return  # Success
+
+        except (EOFError, TimeoutError, OSError,
+                paramiko.SSHException, ConnectionError) as e:
+            print(f"Attempt {attempt}/{max_retries} failed: {e}", file=sys.stderr)
+            if attempt < max_retries:
+                delay = max(5, min(2 ** attempt, 30))
+                print(f"Retry in {delay}s...", file=sys.stderr)
+                time.sleep(delay)
+            else:
+                raise SystemExit(f"ERROR: Upload failed after {max_retries} attempts: {e}")
+        finally:
+            if sftp:
+                try: sftp.close()
+                except Exception: pass
+            if client:
+                try: client.close()
+                except Exception: pass
+
+
+def _print_result(server, local_path, remote_path, file_size, elapsed):
+    info = f"{_fmt_size(file_size)}, {elapsed:.1f}s"
+    if file_size >= 1024 * 1024 and elapsed > 0:
+        speed = file_size / elapsed
+        info += f", {_fmt_size(int(speed))}/s"
+    print(f"OK: {local_path} -> {server['alias']}:{remote_path} ({info})")
+
 def download_file(server: dict, remote_path: str, local_path: str):
     normalized_remote_path = _normalize_remote_path(remote_path)
     client = get_client(server)
diff --git a/version.py b/version.py
index 307546d..c999347 100755
--- a/version.py
+++ b/version.py
@@ -1,6 +1,6 @@
 """Version info for ServerManager."""
 
-__version__ = "1.8.71"
+__version__ = "1.8.73"
 __app_name__ = "ServerManager"
 __author__ = "aibot777"
 __description__ = "Desktop GUI for managing remote servers"