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»Forums Index »IQFeed Developer »IQFeed Developer Support »Problem+solution connecting to an IQFeed port (already in use)
Author Topic: Problem+solution connecting to an IQFeed port (already in use) (1 messages, Page 1 of 1)

-Interested User-
Posts: 35
Joined: Jul 30, 2018

IQML - IQFeed-MATLAB connector

Posted: Apr 10, 2019 05:11 PM          Msg. 1 of 1
Today I spent a few frustrating hours trying to debug a problem when connecting to the Lookup port (for historic data) on a specific machine. For the benefit of others who may encounter a similar problem and search this forum, here's a breakdown of the problem, causes, analysis and solution:

TL/DR: When any other application on the computer uses one of IQFeed's ports, it cannot be used in IQFeed. Solution: either remove the other application, or change IQFeed's default port assignment to some unused port.

  • Historic data failed to download, displaying errors about invalid data arriving on the Lookup port.
  • The IQConnect.txt file did not display any connection message to the Lookup port (only to other ports).
  • The Diagnostic utility was unable to listen to the Lookup port in the <Port Tester> tab, displaying an error message that "The specified address is already in use."

Open DOS Command Window (run as administrator) and run the following command:
netstat -abon

This will display all the active ports and the processes that hold them. For example, in my particular case the relevant line was this:

This tells us that the culprit is the lghub_agent.exe process (part of Logitec's G-Hub application), process ID=2312

  • Uninstall or disable the problematic other application
  • Configure the other application to use a different port (this is often not possible, but sometimes is)
  • Modify IQFeed's default port to use a different port number that is unused. For example, in the case of the Lookup port, the port number is stored in the registry key
    which you can modify using the Windows builtin regedit utility.

I hope this helps someone...

Yair Altman
IQML - IQFeed-MATLAB connector

I am not a DTN employee; my post reflects my personal opinion

Edited by altmany on Apr 10, 2019 at 05:12 PM


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