Lewcifer,
With all due respect as well, I am not guessing. Many firms that accept FIX connections do not have simulation environments, and thus are very quick to disconnect or not respond on bad data. While your suggestions are good, it seems to me that walterjennings is a little new to this in general, so he would probably have an equally tough time with the products that you suggested as he is with Genesis. So, my suggestion to call genesis, act angry enough to get someone on the phone who cares, and work through a login with a tech on the phone, is valid.
walter, 20 years ago I was a "lab consultant" for a intro to programming computer lab at the university I attended, so I am not trying to offend you, but...when you say you are sending:
8=FIX.4.29=9135=A34=149=sendercompid52=20081022-20:16:48.74156=targetcompid95=1996=username,password98=0108=30141=Y10=118
I assume that for tag/value 49=sendercompid
you are not actually putting in the text "sendercompid" and ditto for 96=username,password
I assume you just didn't want to divulge your own info...but, sometimes assuming too much can be bad...
again...get thru to genesis and have a tech on the line, looking at their logs when you send your login...they'll tell you what is wrong, and it may take a couple of attempts and tweaks.