I recently tried a Mapserver layer connected to a PostgreSQL 13.2 database that 
had password_encryption = scram-sha-256.  I was unsuccessful in getting it to 
work until I switched it to md5 and reset the passwords.  The following error 
was logged and the interesting part seems to be (authentication method 10 not 
supported).

[Thu Feb 18 13:57:02.652879 2021] [php7:warn] [pid 16668] [client 
192.168.100.4:57341] PHP Warning:  mapObj::drawQuery(): [MapServer Error]: 
msPostGISLayerOpen(): Database connection failed. Check server logs for more 
details.Is the database running? Is it allowing connections? Does the specified 
user exist? Is the password valid? Is the database on the standard port?\n in 
/Volumes/Data/WebServer/newswc/php/drawmappm.php on line 243, referer: 
http://stagmapservice.swc.nd.gov/
Database connection failed (authentication method 10 not supported
) with connect string 'user=dauser password=****** dbname=swc 
host=dadatabase.blah.blah.blah port=5432'
Is the database running? Is it allowing connections? Does the specified user 
exist? Is the password valid? Is the database on the standard port? in 
msPostGISLayerOpen()msPostGISLayerOpen(): Query error. Database connection 
failed. Check server logs for more details.Is the database running? Is it 
allowing connections? Does the specified user exist? Is the password valid? Is 
the database on the standard port?
msDrawMap(): Image handling error. Failed to draw layer named 'Countries - Natl 
Atlas'.

Is this an issue with MapServer?  If so, will scram-sha-256 authentication be 
supported by Mapserver?

Thanks,

Paul

MapServer version 7.6.2 OUTPUT=PNG OUTPUT=JPEG OUTPUT=KML SUPPORTS=PROJ 
SUPPORTS=AGG SUPPORTS=FREETYPE SUPPORTS=CAIRO SUPPORTS=ICONV 
SUPPORTS=WMS_SERVER SUPPORTS=WMS_CLIENT SUPPORTS=WFS_SERVER SUPPORTS=WFS_CLIENT 
SUPPORTS=WCS_SERVER SUPPORTS=SOS_SERVER SUPPORTS=FASTCGI SUPPORTS=GEOS 
SUPPORTS=POINT_Z_M SUPPORTS=PBF INPUT=JPEG INPUT=POSTGIS INPUT=OGR INPUT=GDAL 
INPUT=SHAPEFILE

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