sqlmapproject/sqlmap · error · NotSupportedError

server requires TDS encryption; the dependency-free client s

Error message

server requires TDS encryption; the dependency-free client supports cleartext only

What it means

Error "server requires TDS encryption; the dependency-free client supports cleartext only" thrown in sqlmapproject/sqlmap.

Source

Thrown at extra/dbwire/tds.py:98

            break
    return b"".join(chunks)

# ---- PRELOGIN ----------------------------------------------------------------------------------------

def _prelogin(sock):
    ver = struct.pack(">IH", 0x11000000, 0)
    enc = b"\x02"  # ENCRYPT_NOT_SUP
    tokens = b"\x00" + struct.pack(">HH", 11, len(ver))
    tokens += b"\x01" + struct.pack(">HH", 11 + len(ver), len(enc))
    tokens += b"\xff"
    _send_message(sock, _PKT_PRELOGIN, tokens + ver + enc)
    body = _read_message(sock)
    off = 0
    while off < len(body) and _u8(body, off) != 0xff:
        token = _u8(body, off)
        toff, tlen = struct.unpack(">HH", body[off + 1:off + 5])
        if token == 0x01 and _u8(body, toff) == 0x03:  # server requires encryption
            raise NotSupportedError("server requires TDS encryption; the dependency-free client supports cleartext only")
        off += 5

# ---- LOGIN7 ------------------------------------------------------------------------------------------

def _encode_password(password):
    out = bytearray()
    for b in bytearray(password.encode("utf-16-le")):
        b = ((b << 4) & 0xf0) | ((b >> 4) & 0x0f)
        out.append(b ^ 0xa5)
    return bytes(out)

def _login7(sock, user, password, database, hostname="dbwire", appname="dbwire"):
    fields = [
        hostname.encode("utf-16-le"),
        (user or "").encode("utf-16-le"),
        _encode_password(password or ""),
        appname.encode("utf-16-le"),
        b"",                              # server name

View on GitHub (pinned to 0a35b20e39)

When it happens

Trigger: Thrown at extra/dbwire/tds.py:98 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of sqlmapproject/sqlmap@0a35b20e39 (2026-08-26). Data as JSON: /api/errors/b0b3d4818d41c9a6. Report an issue: GitHub.