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I am sending a Logon request in telnet:

$ telnet example.com
Trying example.com...
Connected to example.com
Escape character is '^]'.
8=FIX.4.4 9=103 35=A 49=Q142 56=XCD1 34=221 52=20170929-09:36:39 98=0 108=30 553=primexm_hgnh_uat_1_q 554=tVN84Y93THc5 10=023

Then I try to capture the request in Wireshark:

enter image description here

It alert me: the BeginString field is missing, what's the problem when using telnet for test fix protocol

Moon soon
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    have you replaced the [SOH] separators with spaces here or were you typing a space as a separator? https://stackoverflow.com/questions/25293231/fix-message-delimiter – MD-Tech Sep 29 '17 at 14:09
  • I do not know how to type [SOH] of 0x01 in the telnet, so I replaced with space – Moon soon Sep 30 '17 at 01:18
  • Why the ^. at the beginning of the FIX message? – rupweb Sep 30 '17 at 05:12
  • @TangMonk so... You knowingly sent a malformed message and get "Error/Malformed" in response and then had to ash here what the issue is??!! The hex code for SOH is 0x01 depending on your OS and telnet client you have a number of ways to send it. – MD-Tech Sep 30 '17 at 07:42

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