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Why does pyodbc attempt to connect with a blank login when Integrated Security=True?

I have a Python script that tries to connect to a local database but fails.
import pyodbc
connection_string = 'Driver={ODBC Driver 17 for SQL Server};Server=.;Database=testdb;Integrated Security=True;'
connection = pyodbc.connect(connection_string)
pyodbc.InterfaceError: ('28000', "[28000] [Microsoft][ODBC Driver 17 for SQL Server][SQL Server]Login failed for user ''. (18456) (SQLDriverConnect); [28000] [Microsoft][ODBC Driver 17 for SQL Server]Invalid connection string attribute (0); [28000] [Microsoft][ODBC Driver 17 for SQL Server][SQL Server]Login failed for user ''. (18456); [28000] [Microsoft][ODBC Driver 17 for SQL Server]Invalid connection string attribute (0)")
According to the error, pyodbc tried to connect as '' (a blank). I ran the script as my Windows user, verified by running the command whoami in the same terminal from which I executed the script. I Googled pyodbc "login failed for user ''" but Google returned only results where the username in the error is not blank.
I can successfully connect via SQL Server Management Studio with Windows Authentication.
The error message also mentions an invalid connection string attribute. I checked https://www.connectionstrings.com/sql-server/ and I don't see the problem. Breaking it down we have:
Driver={ODBC Driver 17 for SQL Server};
Server=.;
Database=testdb;
Integrated Security=True;
All of these look correct to me. What am I doing wrong?

Unable to connect to Microsoft MySQL server using python code getting error

I'm unable to connect to Microsoft MySQL server using Python code. I'm getting error like below
code
import pyodbc
server = 'xxx'
database = 'xxx'
username = 'xxx'
password = 'xx'
driver='{ODBC Driver 17 for SQL Server}'
with pyodbc.connect('DRIVER='+driver+';SERVER='+server+';PORT=portnumber;DATABASE='+database+';UID='+username+';PWD='+ password) as conn:
Error
Traceback (most recent call last):
File "sqlCode.py", line 12, in <module>
with pyodbc.connect('DRIVER='+driver+';SERVER='+server+';PORT=2078;DATABASE='+database+';UID='+username+';PWD='+ password) as conn:
pyodbc.OperationalError: ('08001', '[08001] [Microsoft][ODBC Driver 17 for SQL Server]Named Pipes Provider: Could not open a connection to SQL Server [2]. (2) (SQLDriverConnect); [08001] [Microsoft][ODBC Driver 17 for SQL Server]Login timeout expired (0); [08001] [Microsoft][ODBC Driver 17 for SQL Server]Invalid connection string attribute (0); [08001] [Microsoft][ODBC Driver 17 for SQL Server]A network-related or instance-specific error has occurred while establishing a connection to SQL Server. Server is not found or not accessible. Check if instance name is correct and if SQL Server is configured to allow remote connections. For more information see SQL Server Books Online. (2)')

Share my experience,
Maybe it's about SSMS permission problem.
You can go to IP>Security>Login>Account>property to confirm whether the account has the permission to connect to the database.
I have the same code as yours, until I do permission confirmation, it works to me.

pyodbc failed to connect to MSSQL

I want to connect to mssql server using pyodbc but somehow I can't connect.
here is the code
import pyodbc
server = '172.xx.xx.xx,1433'
database = 'DATABASE_BI'
username = 'COMPANY\test.xx'
password = 'test123!##'
cnxn = pyodbc.connect('DRIVER={ODBC Driver 17 for SQL Server};SERVER='+server+';DATABASE='+database+';UID='+username+';PWD='+ password)
cursor = cnxn.cursor()
and here is the output
OperationalError: ('08001', '[08001] [Microsoft][ODBC Driver 17 for SQL Server]TCP Provider: The
wait operation timed out.\r\n (258) (SQLDriverConnect); [08001] [Microsoft][ODBC Driver 17 for SQL
Server]Login timeout expired (0); [08001] [Microsoft][ODBC Driver 17 for SQL Server]A network
related or instance-specific error has occurred while establishing a connection to SQL Server.
Server is not found or not accessible. Check if instance name is correct and if SQL Server is
configured to allow remote connections. For more information see SQL Server Books Online. (258)')
I don't know what makes it error. Is it because of the mssql server reject the request?

connecting python to sql server using pyodbc

How to connect python to SQL Server using pyodbc until now I wrote the below script but the system crash and display error:
I tried to connect the script to the localhost sql server and i had a successful connection but when I tried on the server on the same network it did crash
code:
import pyodbc
import pandas as pd
conn = pyodbc.connect(
ENGINE='sql_server.pyodbc',
driver='SQL Server',
NAME='testDB',
SERVER ='WIN-CMUH9TBNL53',
DSN='pythonDSN',
PORT='1433',
UID='test',
PWD="test",
)
cursor = conn.cursor()
sql_query=pd.read_sql_query('select * from testDB.dbo.t1',conn)
print(sql_query)
print(type(sql_query))
error:
pyodbc.OperationalError: ('08001', '[08001] [Microsoft][ODBC SQL Server Driver][DBNETLIB]SQL Server does not exist or access denied. (17) (SQLDriverConnect); [08001] [Microsoft][ODBC SQL Server Driver][DBNETLIB]ConnectionOpen (Connect()). (53); [08001] [Microsoft][ODBC SQL Server Driver]Invalid connection string attribute (0)')

pyodbc.OperationalError: SQL Server does not exist or access denied. (17) (SQLDriverConnect); [08001] ODBC SQL Server Driver][

I have searched the web all day tried many solutions but none works. I can manually connect to this server but not with Python I get this error:
pyodbc.OperationalError: ('08001', '[08001] [Microsoft][ODBC SQL
Server Driver][DBNETLIB]SQL Server does not exist or access denied.
(17) (SQLDriverConnect); [08001] [Microsoft][ODBC SQL Server
Driver][DBNETLIB]ConnectionOpen (Connect()). (5); [08001]
[Microsoft][ODBC SQL Server Driver]Invalid connection string attribute
(0)')
I have tried the following:
A)
cnx = pyodbc.connect(Driver='{SQL Server}',
SERVER=self.DBserver,
DATABASE=xyz,
username=self.DBusername,
password=self.DBpassword,
PORT = 1433)
B)
cnx = pyodbc.connect('''Driver={SQL Server};
SERVER=tcp:<self.DBserver>;
PORT=self.DBPort; DATABASE=xyz;
UID=self.DBusername;
PWD=self.DBpassword''')
C)
cnx = = pyodbc.connect(Driver='{SQL Server}',
SERVER=self.DBserver,
DATABASE=xyz,
UID=self.DBusername,
PWD=self.DBpassword)

The issue was with firewall. it is working now

I'm guessing you need something more like this:
cnx = pyodbc.connect('DRIVER={SQL Server};SERVER='+self.DBserver+';DATABASE=xyz;UID='+self.DBusername+';PWD='+self.DBpassword)

I get the same error when trying to connect to Azure SQL Server with pyodbc (4.0.30) when connected via VPN and running in Windows Subsystem for Linux:
with pyodbc.connect(db_connect_string) as conn:
OperationalError: ('08001', '[08001] [Microsoft][ODBC Driver 17 for SQL Server]TCP Provider: Error code 0x274C (10060) (SQLDriverConnect)')
The Python code is running in WSL (5.10.16.3-microsoft-standard-WSL2) / Ubuntu 20.04.3, openssl version shows: OpenSSL 1.1.1k 25 Mar 2021
I could successfully connect with the same credentials via:
MS Data Studio with VPN
same Python/pyodbc code in Powershell with VPN
same Python/pyodbc code in WSL without VPN (plus adding a firewall rule)
My guess is there must be some interaction between OpenSSL and our] VPN, possibly related to these issues.
https://github.com/mkleehammer/pyodbc/issues/853
https://github.com/microsoft/msphpsql/issues/1112