Difference between revisions of "Modbus TCP Port"
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(Created page with "<p>In a Linux system only root can bind a port < 1024. <br /> As for Modbus TCP the standard port is 502.<br /> In this case you will get the next failure at runtime start-...") |
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| − | + | In a Linux system only root can bind a port < 1024. <br /> | |
| − | < | + | As for Modbus TCP the standard port is 502.<br /> |
| − | + | In this case you will get the next failure at runtime start-up: "Modbus TCP Bind socket failure, retrying...Permission denied"<br /> | |
| − | + | <br /> | |
| − | + | ||
| − | + | * Change the port to a port number > 1024 | |
| − | + | or | |
| − | + | * Set the s-bit on the plc-executable (note: if you rebuild do this again on the new plc-executable) | |
| − | + | <br /> | |
| + | If you are running a firewall: The following commands opens this port:<br /> | ||
| + | |||
| + | |||
| + | sudo iptables -A INPUT -p tcp --dport 502 -j ACCEPT<br /> | ||
| + | <br /> | ||
| + | sudo iptables -A OUTPUT -p tcp --dport 502 -j ACCEPT<br /> | ||
| + | <br /> | ||
| + | |||
| + | TBD:<br /> | ||
| + | |||
| + | sudo sh -c "iptables-save > /etc/iptables.rules" | ||
Latest revision as of 04:51, 27 August 2013
In a Linux system only root can bind a port < 1024.
As for Modbus TCP the standard port is 502.
In this case you will get the next failure at runtime start-up: "Modbus TCP Bind socket failure, retrying...Permission denied"
- Change the port to a port number > 1024
or
- Set the s-bit on the plc-executable (note: if you rebuild do this again on the new plc-executable)
If you are running a firewall: The following commands opens this port:
sudo iptables -A INPUT -p tcp --dport 502 -j ACCEPT
sudo iptables -A OUTPUT -p tcp --dport 502 -j ACCEPT
TBD:
sudo sh -c "iptables-save > /etc/iptables.rules"
