On Friday, March 15, 2019 at 7:57:13 AM UTC-4, Ashim Kapoor wrote:
>
> On Wed, 13 Mar 2019 at 21:21, Mark H. Wood <mwoodiu...@gmail.com> wrote:
>
>> Lines that start with 'host' are appropriate for IP connections, which is 
>> what DSpace will always use.  The host with address '127.0.0.1' is the 
>> local host, and those addresses are typically mapped to the name 
>> 'localhost'.  So the suggested "host dspace dspace 127.0.0.1 
>> 255.255.255.255 md5" allows IP connections from the local host (the same 
>> machine) to the database 'dspace' by the PostgreSQL user 'dspace', using 
>> that user's PostgreSQL password hashed using the MD5 algorithm for 
>> secrecy.  In [DSpace]/config/dspace.cfg and local.cfg you will find that 
>> 'db.url' is set to connect to 'localhost', so DSpace will request IP 
>> ("host") connections from 127.0.0.1 to 127.0.0.1.
>>
>
> Corresponding to :-
>
> "host dspace dspace 127.0.0.1 255.255.255.255 md5"
>
> Where are the instructions for DSPACE to respond with md5 ? Can you please 
> clarify ? 
>
>

The acceptable hashes are negotiated between client and server. I am not 
aware of any way to tell a PostgreSQL client which hash to use.  See 
https://www.postgresql.org/docs/9.3/protocol-flow.html#AEN99727

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