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 connect to the database. Thanks again for your help. -----Original Message----- From: Adrian Klaver <adrian.klaver@xxxxxxxxxxx> Sent: Wednesday, October 30, 2024 12:06 AM To: Daniel Gustafsson <daniel@xxxxxxxx>; 馬 騰飛 <ma-tengfei@xxxxxx> Cc: pgsql-general@xxxxxxxxxxxxxxxxxxxx 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@xxxxxx> 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 which version 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), then SCRAM-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@xxxxxxxxxxx
