Error from

Created: November 12, 2021 | Updated: November 14, 2021

I am receiving an error message when I try to log in to Altium designer. The error message is "Error from The server name could not be resolved"

Starting in Version: 18.0
Up to Version: Current

Solution Details

Please have your IT check the following ports and addresses:


Please check the following ports/addresses to be open in your network and check if antivirus/firewall applications could be set too sharp:

- Internet Ports:
(http): 9880, 9843, 80, 9495
TCP protocol port 9880 is used for HTTP and SOAP requests.
Port 9843 is used for encrypted authentication with SSH.
Port 80
Port 9495 is used by Content Cart.
(https/SSL): 443 (Used by Altium Designer client, Altium License Manager and the AltiumVaults).

- VPN Ports: 1194 and 1723 (Used by Virtual Private network software and relates to users trying to connect to their company network server over a VPN connection from a remote (off site) location.

- Network ports:
TCP 9780 and 9785 (Used for communications between the Altium Infrastructure Server License manger and the client software)
TCP 21001 and UDP 20001 & 20002 (Used for the Legacy Altium Private Server License manager)
HTTP Port - 9780
HTTPS Port - 9785
Synchronization Service Port - 9791
LDAP Service Port - 9790
Websocket Port - 4649
Firebird Server Port - 3050
SVN Port - 3690

- Http addresses that may need to be unblocked: *.altium.*
For example: (, (, (, (, ( , (, (, (, (

- Supplier Searches / Content Vault Part choices:
For communication between Altium Designer and Ciiva, verify that the following sites/ports are allowed: (https port) (https port) (http port) (http port) (http port) (http port)

Part Choices: Connects to the server

White-listing the following domain name addresses on your corporate server / firewall / antivirus, sometimes helps too because Altium Designer connects to Altium's servers on the following host:
- *
- *
- *
- *
- *
- *

These three addresses need to be unblocked to use the online installer:

- If the situation is not solved / Ports cannot be opened -


- Please do a fresh reinstallation with the offline installer:
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