500 Internal Server Error while generating PDF for Print Designer formats in ERPNext v15

Ananthan · February 1, 2026, 7:32am

I am facing a 500 Internal Server Error when trying to generate PDF output for a Print Designer print format in ERPNext v15.

The issue occurs only for PDF generation of Print Designer print format
HTML/Jinja print formats generate PDFs without any issue

Environment Details

ERPNext Version: v15
Frappe Version: v15 (bundled with ERPNext)
Deployment: VPS (Ubuntu 24.04)
Web Server: Nginx 1.24.0
PDF Engine: wkhtmltopdf (installed and working for other formats)

Error Details

When clicking Print for a sales invoice or purchase invoice item I face the below errors, the following request fails:

During PDF generation for Print Designer formats, the browser requests images using port 8000, for example:

https://erpvps.desaitechindia.com:8000/public/files/desaitechlogo.jpg https://erpvps.desaitechindia.com:8000/files/signature.png

The same images are accessible without port 8000, for example:

https://erpvps.desaitechindia.com/public/files/desaitechlogo.jpg https://erpvps.desaitechindia.com/files/signature.png

This behavior is observed only during PDF generation for Print Designer formats.
HTML preview and Jinja/HTML print formats do not show this issue.

The error occurs only for Print Designer formats.

What I Have Already Tried

Restarted bench and services
Verified wkhtmltopdf installation
Cleared cache and rebuilt assets
Tested multiple Print Designer formats
Confirmed file and image URLs are accessible

None of the above resolved the issue.

asieftejani · February 2, 2026, 6:58am

Try to add “host_name”: “https://erpvps.desaitechindia.com:8000” as key:value to sites/<site_name>/site_config.json

github.com/frappe/frappe_docker

wkhtmltopdf error everytime i compose

opened 01:56PM - 20 Aug 25 UTC

closed 12:11AM - 05 Dec 25 UTC

asieftejani

enhancement no-issue-activity

Everytime I spin up the containers for production and need pdf i need to fix thi…s error which I get: - OSError: wkhtmltopdf reported an error: Exit with code 1 due to network error: ConnectionRefusedError Need to add "host_name": "http://frontend:8080" as key:value to sites/frontend/site_config.json Please do you think you can automate this in future releases in case it effects others also Thanks for an amazing product

github.com/frappe/frappe_docker

Hostname Configuration Issues for Print Formats and Links with docker-compose (pwd.yml) or easy-install.py

opened 05:01AM - 15 Jan 25 UTC

edardev

bug

# **Hostname Configuration Issues for Print Formats and Links with `docker-compo…se` (`pwd.yml`) or `easy-install.py`** ## **Description** When using `docker-compose` (`pwd.yml`) or `easy-install.py`, the `host_name` must be set to the frontend service's Docker-assigned IP and port, or the service name, for print formats and email attachments to work. For example, this command resolves the issue for print formats and attachments: ```bash bench --site sub.domain.com set-config host_name frontend:8080 ``` However, this causes links in emails and/others places to use `http://frontend:8080/...` instead of the actual domain name like `https://sub.domain.com/...`. --- ## **Expected Behavior** - Links in emails and apps should use the real domain name (`https://sub.domain.com/...`). - Print formats and attachments should work without requiring `host_name` to be set to `frontend:8080`. --- ## **Actual Behavior** - Print formats and email attachments fail unless `host_name` is set to `frontend:8080`. - Links in emails and apps are incorrect when using `frontend:8080` in `host_name`. --- ## **Environment** - **Docker Compose Setup**: `pwd.yml` - **Installation Method**: `easy-install.py` --- ![Image](https://github.com/user-attachments/assets/42548f05-43df-44a2-b167-5d1abd6a4a93) ![Image](https://github.com/user-attachments/assets/89dfc5c6-15a4-40e8-aec1-c14b7b0cac4b) ![Image](https://github.com/user-attachments/assets/19c38e30-d52e-4749-9ffc-18e68c88a996)