I've installed PostgreSQL with Postgis (tried both version 9.4 and 9.5 ) on a remote desktop running Windows 7 64bit.

However, when I executed this SQL command: "CREATE EXTENSION postgis" (on PgAdmin run as administrator), this message came up:

ERROR: could not load library "C:/PostgreSQL9_5/lib/rtpostgis-2.2.dll": The specified procedure could not be found.

********** Error **********

ERROR: could not load library "C:/PostgreSQL9_5/lib/rtpostgis-2.2.dll": The specified procedure could not be found. SQL state: XX000

I can confirm that "rtpostgis-2.2.dll" was there.

Please tell me how to fix this. It's so frustrating to uninstall and then reinstall every time but the problem still persisted.

P/s: On my Home PC running Windows 10 64bit, PostgreSQL is running like a charm. Postgis and Pgrouting extension can be created easily.

  • Are you able to connect to a psql session on the remote machine. I am wondering if it is a permissions issue. Apr 1, 2016 at 10:01
  • Did you mean "using psql in command line?". Actually I tried connecting to the database by using command line but it just gave a error message, kind of "psql not recognizable".
    – Nikolas
    Apr 1, 2016 at 11:36
  • I did mean that, yes. It is likely, as it is a remote machine, that the you don't have the path to the Postgres executables set as an environment variable. Try echo %PATH% in a cmd prompt on remote machine. If that does not contain a path to the Postgres binaries, then either add it, or run CREATE EXTENSION postgis from that location. Apr 1, 2016 at 12:11
  • I've tried:: 1-Add PATH to Postgres bin folder -> Still no use//// 2-Install PostgreSQL 9.3 and run cmd from bin folder, using psql to "create extension postgis" -> the same error occured. On this remote desktop (a virtual machine run on server), I've once succeeded in install PostgreSQL 9.4, create postgis ext and...., everything was fine, until I upgrade this to version 9.5.
    – Nikolas
    Apr 1, 2016 at 13:56
  • I am also having same problem. Seems like something wrong with 95 Apr 1, 2016 at 20:25

1 Answer 1


I suspect you are running the latest PostgreSQL Patch released yesterday. I have confirmed an incompatiblity issue with latest release OpenSSL and the libcurl we ship - detailed here - http://www.postgresonline.com/journal/archives/364-PostGIS-2.2-Windows-users-hold-off-on-installing-latest-PostgreSQL-patch-release.html

We have compiled a new version of curl compiled with same version of OpenSSL that ships with PostgreSQL 9.5.2.


Replace your libcurl-4.dll with the one in this zip and it should resolve your problems.

  • I had the same issue (Win7 x64) and I can confirm that the substitution fix the issue!
    – gmas80
    Apr 3, 2016 at 1:34
  • I ran into the same problem when installing postgis from the Application Stack Builder and this dll fixed the issue, but I had some difficulty getting it to work. The issue was that I could put the patched file in, but it would get overwritten again with the incompatible version when I tried to do the install. During the install it pauses to ask a few yes/no options, at that point I could paste the patched version in and it would work. Hopefully that helps if anyone else is running into the same issue.
    – Ben Sutton
    Apr 8, 2016 at 19:53
  • 1
    I just put up PostGIS 2.2.2 on Application Stackbuilder for PostgreSQL 9.5 (x32/x64). These have the fixes, so for future people having this issue, just install the lastst from Stackbuilder. Can also get from postgis.net/windows_downloads The binaries for other versions should work too but haven't packaged installers for others yet.
    – Regina Obe
    Apr 10, 2016 at 4:56
  • I am having the same issue running postgres 9.3 and postgis 2.2. I replaced the libcurl-4.dll with the one you provided, but I am still getting the same error? And the rtpostgis-2.2.dll is in the location where it says it can't be found.
    – kflaw
    Apr 24, 2016 at 20:13
  • That's the wrong one for 9.3. I haven't released 9.3 2.2.2 stackbuilder yet - but you can pull the curl from binaries - winnie.postgis.net/download/windows/pg93/buildbot/… which is in folder: winnie.postgis.net/download/windows/pg93/buildbot (if you replacea ll teh files, you'll have PostGIS 2.2.2
    – Regina Obe
    Apr 25, 2016 at 21:17

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