Error: 1030 – Protocol Driver Error Troubleshooting Steps and Suggestions (CTX911130)


Error: 1030 – Protocol Driver Error Troubleshooting Steps and Suggestions
• CTX911130
• Created On: Feb 04, 2003
• Updated On: Jul 09, 2014
• Article
• Topic: Connectivity

A 1030 Protocol Driver error message is received.
The 1030 Protocol Driver error can be caused due to multiple reasons. Each step must be taken and verified as true.
See the following articles for causes this can occur and procedures to troubleshoot the error:
CTX108782 – Error: Cannot connect to the Citrix MetaFrame server. Protocol Driver error.
CTX105793 – Error: Cannot connect to the Citrix server. Protocol Driver Error
CTX130130 – The Protocol Error 1030 is Displayed when Citrix Branch Repeater is Enabled
Caution! This fix requires you to edit the registry. Using Registry Editor incorrectly can cause serious problems that might require you to reinstall your operating system. Citrix cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk. Be sure to back up the registry before you edit it.
Check the configuration of the server:
1. Ensure that the server has the latest Terminal Server or Windows 2000 service pack level.
2. Ensure that the Network Interface Card (NIC) has the latest driver installed.
3. For MetaFrame 1.8, ensure you have Service Pack 2 installed.
4. Check the event log for any 1004 Terminal Server licensing errors.
5. Check that the subnet mask is consistent on every MetaFrame server in the farm.
On the client
1. Ensure that you are using the latest client build. For updates to this, go to A listing of the latest clients and their respective build numbers are available there.
2. Ensure to use the latest IP stack for the client operating system.
If all appropriate updates to the server and client are applied, attempt the following items:
a. Increase the idle winstation pool count in the registry. By default, Terminal Server creates two idle winstations. Increase this count by two and re-try. Edit the following registry key by using REGEDT32:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server

Note: Each idle winstation takes one megabte of RAM. Take this into consideration when adjusting this count.
b. Adjust or remove any TCP KeepAlive settings that may have been added. For this functionality to be added, MetaFrame 1.8 Service Pack 1or higher is required. Refer to Citrix Document: CTX708444 – Configuring TCP KeepAlive Values to Improve WAN Links and ICA KeepAlives to Place ICA Session in a Disconnected State
If connecting over a WAN or Internet connection, ensure that the following ports are opened:
• Port 1494 for TCP/IP is opened.
• Port 1604 for UDP is open Inbound on the firewall.
• Port 1023 and above (The High Ports) are opened for TCP and UDP outbound.
If using Network Address Translation, refer to CTX039746 – IMA and ICA Browsing With Firewall Address Translation (NAT).
In some instances (depending on Firewall manufacturer), all connections through the Firewall might be reset when a rule is added to the Firewall. This has been verified to occur on Checkpoint Firewalls.
If users are receiving this error when attempting to authenticate to a Server Farm, make sure that the Program Neighborhood Service is started. If this is confirmed, the load level of the Server Farm(s) could be an issue. The following article should assist you with troubleshooting this: CTX357152 – Application Load Levels Defined: 10000, 10000!, 10001, 10002, 9999
If none of the above items resolve the issue, there might be an issue with the ICA Master Browser. Check and see if the ICA Master Browser Service is started on the server that you are trying to connect to.
If the service is started, and you have multiple Citrix servers in your environment, configure a different Citrix server to become the ICA Master Browser by default. Then, force an election. Once the new server is registered as the ICA Master Browser, try the connection again.
Special Considerations when Connecting to an Application with Citrix A.L.E.
If you receive an Error 1030: Protocol Driver Error when connecting to a web published application, try a connection with the full version of the ICA Client for Win32. Create a Custom ICA Connection to the published application and attempt the connection. If this is not successful, follow the instructions previously noted. If this type of connection works, then the contents of the ICA File need to be reviewed. For more information refer to the Solutions Knowledgebase Article “Checklist for Connecting to a Citrix Server by ICA Link on Web Page”. Look for a section titled “The ICA File”.
If you are running the ICA Client to connect to a Windows 2000 Server, you are required to have one of each of the following licenses:
• Microsoft Client Access License.
• Terminal Services Client Access License.
If you do not have a sufficient number of these licenses installed onto your server, you cannot connect to the Windows 2000/MetaFrame 1.8 server.
Customers using Windows 9x might get the 1030 protocol driver error while Windows 2000 based clients do not receive the error.
In order to connect to Windows 2000/MetaFrame 1.8, use client version 4.21.779 or higher on Windows 32-bit workstations. With the release of this client, the connection checks for available Microsoft Licenses (both regular CAL and Terminal Services CAL (if not connecting from a Windows 2000 Professional based client) before a connection is established. If the connection fails, then check the Microsoft product License manager to see if you are complying with this licensing scheme.
Also, be sure that your Windows 2000 Terminal Licenses are activated! If they are not activated, you receive the 1030 error.