Epson Job Status Code 311
On the WorkForce Pro WF-C878R/WF-C879R job-status platform, code 311 identifies a scan to email / dns condition. The job type matters because Epson reuses nearby numeric ranges for different scan and forwarding functions.
Error meaning
DNS error while resolving the email server.
This meaning is tied to the reviewed family/platform and subsystem below; do not reuse the number by itself on a different printer family or protocol.
Applies to
Epson WorkForce Pro WF-C878R/WF-C879R job-status platform
- WorkForce Pro WF-C878R
- WorkForce Pro WF-C879R
Common formatting
These are formatting/lookup aliases for this reviewed condition, not separate error pages.
- 311
- Epson 311
- WF-C878R 311
- WF-C879R 311
What usually causes it
- The email-server host name cannot be resolved by the configured DNS server.
- The printer has an incorrect DNS server, gateway, or network configuration.
- The saved mail-server name is wrong or no longer exists.
What to try
Check the email-server name
Compare the saved SMTP host name with the mail administrator's current value.
Check DNS on the printer
Review the TCP/IP DNS settings and confirm the configured DNS service is appropriate for the printer network.
Check the network connection report
Use Epson's network report/connection tools to confirm the device is connected before changing mail credentials.
Retry the same Scan to Email
After name resolution is corrected, send the original small scan again.
After each corrective action
Retry the same operation that produced 311. If it now works, stop there rather than changing unrelated printer, network, or service settings.
If the code returns
A repeated 311 with a correct server name indicates the device still cannot resolve that name. Focus on DNS/network path, not the SMTP password.
When service may be needed
The checks above stay at the user/admin configuration level. If the setting is controlled by an organization, use the administrator rather than bypassing security or certificate requirements.
Continue with guided troubleshooting
If the printer still is not working after the reviewed checks, carry this verified error context into the guided troubleshooter.
Related information
Verified source
Official Epson WF-C878R Job Status Error Codes FAQ, corroborated against the WF-C879R User's Guide for the same code table.