Support
Get help with IM3270
Frequently Asked Questions
How long is the free trial?
60-day free trial with full functionality. No credit card required.
Installer vs Portable version?
Installer creates Start Menu shortcuts. Portable is a single executable that runs without installation.
Why do I need wc3270/x3270?
IM3270 uses the proven x3270 suite for core 3270 emulation while providing a modern UI.
Can I use SSL/TLS?
Yes! Check "SSL" in the connection dialog or use --ssl command line flag.
How do I customize shortcuts?
Open the Keyboard Shortcuts Editor via Edit → Keyboard Shortcuts or Ctrl+Shift+K.
Where are settings stored?
Windows: %APPDATA%\im3270
Linux: ~/.config/im3270
Where can I find diagnostic information?
Check ~/.im3270/im3270.log for startup diagnostics. This log contains detailed information about s3270 detection, connection attempts, and error details that can help troubleshoot issues.
How do I verify my download is authentic?
Starting with v0.44.0, all releases include SHA256 checksums and GPG signatures. After downloading, verify with:
- Quick check:
sha256sum -c SHA256SUMS --ignore-missing - Full GPG verification: See our Security page for step-by-step instructions
The Linux installer also automatically verifies the AppImage checksum during installation.
Troubleshooting
"s3270/wc3270 not found"
Install the prerequisite for your platform:
- Windows: Install wc3270
- Linux: Build s3270 v4.0+ from source. See the Installation Guide for instructions.
Connection timeout
Check hostname, port, firewall settings, and VPN if required.
Shortcuts not working
May conflict with OS shortcuts. Use Ctrl+Shift+K to reassign.
File transfer fails
Ensure you're at TSO READY prompt, dataset name is correct, and you have permissions.
Reporting Issues
When reporting an issue, please include:
- IM3270 version (Help → About)
- Operating system and version
- Steps to reproduce
- Error messages (if any)
- Screenshots if helpful