Python Exception <OSError>: Could not find a suitable TLS CA certificate bundle, invalid path.

What are you doing to cause this error message?

I was reading a feature service from ArgGIS Portal using reader.

@blue_star​ 

What type of authentication are you using with the ArcGIS Portal Reader? If you're using a web connection, check that you've setup your web service according to these instructions: https://community.safe.com/s/article/How-to-create-an-FME-Web-Connection-for-Esri-ArcGIS-Portal-Feature-Service-OAuth-2-0

Additionally if you're able to share a copy of your log file from running the workspace that would help too.

@blue_star Hi there, just in case you’re still encountering this error, I think there’s something worth checking on. Could you have a look at your system Environment Variables, and see if any of the following are present:

CURL_CA_BUNDLE
REQUESTS_CA_BUNDLE
SSL_CERT_FILE
SSL_CERT_DIR

If you see any of these system environment variables, have a look at their value. Do you see any of them pointing to C:\Program Files\PostgreSQL\15\ssl\certs\ca-bundle.crt

You can access your Environment Variables by opening File Explorer, then right-clicking on This Computer and selecting Properties. Once your System > About page pops open, you'll see Advanced system settings located just beneath the Device specifications information. Choose Advanced system settings, and then choose Environment Variables in the dialog that pops up.

Let us know what you see; a screenshot is very welcome!

Hi ​@natalieatsafe  I'm also encountering this error after having installed PostgreSQL. This seems to interfere with the feature reader for reading ArcGIS server feature services. 

Is there a way to work around this error? I've tried uninstalling PostgreSQL which worked for a little while, but now it stopped working again. It seems weird that the reader/python module searches for a certificate which only comes with PostgreSQL. I'm encountering this on FME Form but found this thread, thats why i'm replying here.

Here is the error:

2025-11-24 11:58:24|      |     |ERROR |Worker 43700 > Message Type: fme::internal::_v0::py::Exception
2025-11-24 11:58:24|      |     |ERROR |Worker 43700 > Python Exception <OSError>: Could not find a suitable TLS CA certificate bundle, invalid path: C:\Program Files\PostgreSQL\13\ssl\certs\ca-bundle.crt
2025-11-24 11:58:24|      |     |ERROR |Worker 43700 > Failed to obtain any schemas from reader 'ARCGISFEATURES' from 1 datasets. This may be due to invalid datasets or format accessibility issues due to licensing, dependencies, or module loading. See logfile for more information

​@vosgeo-analyses Hi there, thanks for posting! If you have already checked on the environment variables I listed above (both System and User variables), and that check doesn’t really offer you any clues into this behavior, then it would be best to submit a Support Ticket to our Support team. Putting in a Support Ticket will allow our Support team to do a more detailed, focused investigation of the issue with you.

You can put in a Support Ticket by filling in the request form available here: https://support.safe.com/hc/requests/new