8. Finally, click the OK button.
Port Information Preset in Firewalls
Some of the port information present in firewalls of an Alibaba Cloud server is:
Application Type | Protocol | Port Range | Description |
HTTPS | TCP | 443 | The default HTTPS port. |
HTTP | TCP | 80 | The default HTTP port. |
SSH | TCP | 22 | The default SSH port. |
FTP | TCP | 21 | The default FTP port. |
TELNET | TCP | 23 | The default Telnet port. |
MySQL | TCP | 3306 | The default MySQL port. |
All TCP | TCP | 1 to 65535 | All TCP ports. |
All UDP | UDP | 1 to 65535 | All UDP ports. |
All UDP and TCP | UDP + TCP | 1 to 65535 | All UDP and TCP ports. |
Request to Enable TCP Port 25
For security purposes, the Alibaba Cloud server blocks outbound traffic transmitted through TCP port 25. Therefore, users cannot use Alibaba Cloud instances to access external addresses through TCP port 25. In order to enable TCP port 25, follow the below steps:
1. First, log in to the Alibaba Cloud Security Control console.
2. Select Application >> Open Port 25. On the page that appears, click the Apply button to open Port 25 in the upper-right corner.
3. Select an IP address type, and fill out the following application form. Set the following parameters in the application form:
4. Then, click the OK button.
5. Tick the Agreed “Terms Governing the Use of Port TCP 25” option and click the Next button.
6. On the next page, fill out the application form and describe the use of TCP port 25 in detail. On the application form, set the following parameters:
7. Finally, click the OK button to submit the user’s application.
Conclusion
This tutorial presents the steps to manage the firewall and enable TCP port 25 on an Alibaba Cloud server. Hope this tutorial was helpful, and do reach out to us if you have any queries or suggestions.