Message An unknown error occurred while communicating with server. |
Cause of Error The port required for connection is blocked by Windows Firewall. |
Solution Summary Ensure 'Allow local port exceptions' from Windows Firewall is enabled. Open 'Control Panel'. Double-click 'Windows Firewall'. Click 'Exceptions'. Click 'Add Port'. Enter 'DCOM_TCP135' in 'Name' box. Enter '135' in 'Port number' box. Select 'TCP'. Click 'OK'. |
Solution Details Windows Firewall is a program that provides protection against virus threats and any external unauthorized access. Certain ports are disabled by the firewall to protect the computer. Users can access resources that are allowed by the firewall on a network. To unblock the DCOM port: 1) Ensure that the 'Allow local port exceptions' setting in 'Group Policy' from the Windows Firewall is enabled. 2) Click 'Start', and click 'Control Panel'. (The 'Control Panel' window appears.)  'Control Panel' window3) Double-click the 'Windows Firewall' icon. (The 'Windows Firewall' dialog box appears.) 'Windows Firewall' dialog box4) Click the 'Exceptions' tab. (The 'Exceptions' tab appears.) 'Exceptions' tab5) Click 'Add Port'. (The 'Add a Port' dialog box appears.) 'Add a Port' dialog box 6) Enter 'DCOM_TCP135' in the 'Name' box. 7) Enter '135' in the 'Port number' box. 8) Select the 'TCP' option. 9) Click 'OK'. 10) Click 'OK'. |
Applies to Software Version Citrix Access Suite 4 |
Error: Unable to connect to a server in Citrix Access Suite.
