InvalidCredentials, this error appears only with some users and it is confirmed that the credentials are correct

[cdmb80]

def Login():

if request.method=="POST":
    login = request.form
    username= login['username']
    password = login['password']
    
if not '@example.com' in username:
    u = username + '@example.com'
    
#else:
    #u=username.lower()

# AD-Server connection

server = "xxxxxxxxxxxxx"
getserverInfo = Server(server, get_info=ALL)

`` try: c=Connection(getserverInfo, user=u,password=password,auto_bind=True) except Exception as e: print(e)

[zorn96]

this might be a result of policies in your domain. it's unclear if you're using ldaps/startTLS, and it looks like you're using simple binds rather than SASL

some users in your domain might be restricted to either only binding over TLS-secured connections. some users also might not be allowed to login via username/password over LDAP, they might be required to use Kerberos or another SASL mechanism. there can also be different restrictions based on where a login comes from

unfortunately, the domain won't always give great information about why it failed the bind. you could try checking with your AD admin about policies there