# How to bypass SSL for PROJ reprojection

DevFeed: [How to bypass SSL for PROJ reprojection](<https://devfeed.tech/articles/how-to-bypass-ssl-for-proj-reprojection-35590.md>)

Original publisher: [Read original article](<https://blog.rtwilson.com/how-to-bypass-ssl-for-proj-reprojection/>)

Author: Robin Wilson

Published: 2026-03-23T16:23:36Z

Content type: tutorial

Language: en

Sources: [Robin Wilson](<https://devfeed.tech/sources/robin-wilson.md>)

Topics: [Geographic Information System](<https://devfeed.tech/topics/gis.md>), [Security](<https://devfeed.tech/topics/security.md>), [SSL](<https://devfeed.tech/topics/ssl.md>), [import](<https://devfeed.tech/topics/import.md>), [Linux](<https://devfeed.tech/topics/linux.md>), [osx](<https://devfeed.tech/topics/osx.md>), [Windows](<https://devfeed.tech/topics/windows.md>)

Tags: [academic](<https://devfeed.tech/tags/academic.md>), [command](<https://devfeed.tech/tags/command.md>), [computing](<https://devfeed.tech/tags/computing.md>), [gis](<https://devfeed.tech/tags/gis.md>), [how-to](<https://devfeed.tech/tags/how-to.md>), [import](<https://devfeed.tech/tags/import.md>), [linux](<https://devfeed.tech/tags/linux.md>), [osx](<https://devfeed.tech/tags/osx.md>), [remote-sensing](<https://devfeed.tech/tags/remote-sensing.md>), [security](<https://devfeed.tech/tags/security.md>), [ssl](<https://devfeed.tech/tags/ssl.md>), [windows](<https://devfeed.tech/tags/windows.md>)

## AI overview

This tutorial explains how to temporarily disable SSL verification for PROJ during coordinate reprojection when self-signed or misconfigured certificates cause downloads of conversion data to fail. It notes the security trade-off and points to setting a PROJ environment variable.

## Source excerpt

A friend was using GDAL's ogr2ogr command to import some data to PostGIS recently, and as part of the import they were doing a reprojection of the data. They got the following error: PROJ: Cannot open https://cdn.proj.org/uk_os_OSTN15_NTv2_OSGBtoETRS.tif: schannel: the certificate or certificate chain is based on an untrusted root They've had various SSL errors on [...]