Written by Jason Feemster, POS specialist with 15+ years of experience helping restaurants and retailers troubleshoot POS systems, payments, and hardware issues.
Common Issue: MICROS Error 701 “No Communications” appears when the workstation cannot reach the BOH server or database.
Fast Fixes: Restart workstation, reboot BOH server, check Ethernet connections, verify IP settings, and restart MICROS services.
Need official help? See our MICROS POS Support Guide
Want guided troubleshooting? Try the POSUSA POS Support Assistant (Free).
MICROS Error 701 “No Communications” happens when the workstation loses connection to the back-of-house (BOH) server. The terminal might show red “No Comms” error icons and drop into Offline Mode, making it impossible to send orders or process payments.
Here’s how to diagnose and fix Error 701 fast so your restaurant can keep running.
Table of Contents
Common Reasons MICROS Error 701 Happens
- BOH server is offline or frozen
- Loose or damaged Ethernet cable
- Network switch/router rebooted or failed
- Wrong or missing static IP address
- MICROS CAL or database service stopped
- Firewall blocking communication ports
How to Fix MICROS Error 701 “No Communications”
1. Restart the MICROS Workstation
This forces the terminal to re-establish its database and network connection.
- Shut down from the restart menu
- Wait 10–15 seconds
- Power back on
If the BOH server is reachable again, Error 701 will usually disappear.
2. Reboot the BOH Server + Restart CAL
If multiple workstations show 701, the BOH server is likely the issue.
- Reboot the server if applications are frozen
- Restart “MICROS CAL” service in Windows Services
- Restart “MICROS Database” service if needed
When CAL stops, orders can’t route — so terminals go “No Comms” immediately.
3. Check Ethernet Cables & Network Equipment
Even a momentary network drop can cause Error 701.
- Confirm the Ethernet cable is firmly plugged into the terminal
- Check for active link lights on the switch port
- Swap to another port or cable to rule out failure
This is one of the most common causes of communication failures.
4. Verify Static IP Address Settings
If the workstation loses its static IP, it won’t be able to locate the server.
- Confirm the terminal’s static IP matches the MICROS config
- Verify correct subnet mask
- Ping server’s IP address from the workstation
Power cycles sometimes cause terminals to default back to DHCP — triggering this error.
5. Restart Network Switch or Router
If the entire system is offline, your network hardware may be the source.
- Restart the switch or router that serves the BOH
- Check whether other devices have connection issues
Network failure = system-wide “No Communications.”
6. Check Firewall & Antivirus Exceptions
Security software can sometimes block MICROS communication ports.
- Temporarily disable firewall for testing
- Whitelist MICROS applications in security rules
Always re-enable firewall protection after testing.
When to Contact MICROS Support
- All terminals show Error 701 and won’t reconnect
- CAL or database continues to crash
- Server won’t reboot or stay online
- You see network hardware failures
👉 CONTACT MICROS SUPPORT – Phone & Online Customer Service
MICROS Error 701 – FAQs
What causes Error 701 in MICROS?
Does Error 701 mean the server crashed?
Can Error 701 cause Offline Mode?
Why does Error 701 come back randomly?
Try the POSUSA POS Support Assistant
Need step-by-step help resolving MICROS Error 701?
- POSUSA POS Support Assistant
- Select MICROS
- Type: “Error 701”
- Follow the guided troubleshooting flow
It’s fast, free, and the easiest way to get MICROS online again.
Thinking About Switching POS Systems?
If you’re dealing with repeated POS issues, it might be time to compare more reliable options built for restaurants and retail businesses.
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