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--- developers:fixapi:traderlogonresponse [2025/09/12 01:19] – removed - external edit (Unknown date) 127.0.0.1
+++ developers:fixapi:traderlogonresponse [2025/09/12 02:41] (current) – chad
@@ Line 1: / Line 1: @@
+====== TRADER LOGON RESPONSE [35=UCI] ======
+The Trader Logon Response message confirms or rejects Trader Logon attempts.
+===== Response Indicators =====
+  * **Success:** Text (58) = "Success"
+  * **Failure:** Text (58) = Error description
+  * Failed logon doesn't disconnect FIX session
+===== Message Specification =====
+**Message Direction:** T4 → Client
+^ Tag ^ Field Name ^ Type ^ Req'd ^ Description ^
+| | **Message Header** | | Y | MsgType = UCI |
+| 553 | UserName | String | Y | T4 Trader username |
+| 58 | Text | String | Y | Success or failure reason |
+| | **Message Trailer** | | Y | |
+===== Sample Messages =====
+**Successful Response:**
+<code>
+=FIX.4.2|9=100|35=UCI|49=test|56=T4Test|50=T4FIX|52=20150612-15:35:03.725|
+=Trader1|58=Success|10=234|
+</code>
+**Failed Response (Bad Password):**
+<code>
+=FIX.4.2|9=150|35=UCI|49=test|56=T4Test|50=T4FIX|52=20150612-15:34:50.261|
+=Trader1|58=Login failed: most likely incorrect trader and password combination|10=234|
+</code>
+===== Notes =====
+  * Session continues after failed trader logon
+  * Master User and other authenticated traders remain connected
+  * Trader must have assigned accounts/exchanges for success