Thank you very much for your response.
After changing the "password_encryption" option to "md5" in the postgresql.conf file, the server can now successfully
connectto the database.
Thanks again for your help.
-----Original Message-----
From: Adrian Klaver <adrian.klaver@aklaver.com>
Sent: Wednesday, October 30, 2024 12:06 AM
To: Daniel Gustafsson <daniel@yesql.se>; 馬 騰飛 <ma-tengfei@nec.cn>
Cc: pgsql-general@lists.postgresql.org
Subject: Re: Compatibility Issues with Npgsql and .NET Framework 3.5 after Upgrading to PostgreSQL 16.3
CAUTION：This is an external email. Please be cautious when opening links or attachments in email.
On 10/29/24 04:01, Daniel Gustafsson wrote:
>> On 29 Oct 2024, at 04:25, 馬 騰飛 <ma-tengfei@nec.cn> wrote:
>>
>> Thank you very much for your reply.
>> However, after installing PostgreSQL 16.4, our server still encounters the following error when connecting to the
database,just like with version 16.3:
>> “Only AuthenticationClearTextPassword and AuthenticationMD5Password supported for now. Received: 10”.
>> Could you please advise how to resolve this error? Should we also update Npgsql? If Npgsql needs to be updated, to
whichversion should we update it?
>
> I don't know the first thing about Npgsql so I can't offer any advice,
> but it sounds like the problems is that the server wants to use SCRAM
> passwords and your version of npgsql only support cleartext and md5.
> Changing the METHOD in pg_hba.conf to md5 could fix the immediate
> problem perhaps but upgrading to a version that support SCRAM seems
> the most appropriate (especially since md5 passwords are likely going away soon).
Potential issue with above per:
https://www.postgresql.org/docs/current/auth-password.html
"To ease transition from the md5 method to the newer SCRAM method, if
md5 is specified as a method in pg_hba.conf but the user's password on the server is encrypted for SCRAM (see below),
thenSCRAM-based authentication will automatically be chosen instead."
Therefore a roles password could still be in SCRAM. You would need to change the actual passwords also.
According to the issue below Npgsql supports SCRAM:
https://github.com/npgsql/npgsql/issues/5593
Which translates into Npgsql 3.2.7:
https://github.com/npgsql/npgsql/releases/tag/v3.2.7
>
> --
> Daniel Gustafsson
>
>
>
--
Adrian Klaver
adrian.klaver@aklaver.com
