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»Forums Index »NEW IQFEED FORUMS »IQFeed API Questions »HTTP 1.1/ 400 Bad request response upon request

Author	Topic: HTTP 1.1/ 400 Bad request response upon request (4 messages, Page 1 of 1)
alexfe -Interested User- Posts: 2 Joined: May 24, 2022	Posted: May 24, 2022 02:10 PM Msg. 1 of 4 I am supporting application using iqfeed, establishing 3 socket connections: Admin, Level1, Lookup. It works on most of the workstations. However for the one specific workstation I am receiving the following bad request response on Lookup socket: Normal: -> S,SET PROTOCOL,5.2 <- S,CURRENT PROTOCOL,5.2 Exception: -> S,SET PROTOCOL,5.2 <- HTTP/1.1 400 Server: WebSocket++/0.8.2 Actual software installed 6.1.0.20 Any ideas how should I troubleshot this issue? fwiw, on that specific workstation IQFeed own sample application doesn't show Option Chains. Thank you.
altmany -Interested User- Posts: 73 Joined: Jul 30, 2018 IQML - IQFeed-MATLAB connector	Posted: May 24, 2022 02:23 PM Msg. 2 of 4 You probably have a non-IQFeed process on that computer that uses the same port number (Lookup=9100 by default). Run `netstat -on` to see which process it is and then either stop that process, or modify the Lookup port number in the Windows registry. Yair Altman IQML - IQFeed-MATLAB connector https://UndocumentedMatlab.com/IQML I am not a DTN employee; my post reflects my personal opinion
alexfe -Interested User- Posts: 2 Joined: May 24, 2022	Posted: May 24, 2022 03:06 PM Msg. 3 of 4 Yair, thank you! that was it! logitech mouse driver!
DTN_Gary_Stephen -DTN Guru- Posts: 394 Joined: Jul 3, 2019	Posted: May 24, 2022 03:44 PM Msg. 4 of 4 The Logitech mouse utility "LGHubUpdater" is known to interfere with IQFeed, because it also uses Port 9100. Easiest solution is just to disable that app, though it is also possible to change what ports IQFeed uses via registry entries. Sincerely, Gary Stephen DTN IQFeed Implementation Support Specialist