There were some security patches applied to the server that were catching the login attempts from MQ. There were at least two issues. One that was blocking the request outright and one that appeared to make the request parser more strict.

I’ve worked with the host to get the block fixed but I had to patch mq2emulogin because of the request formatting. It looks like it’s mostly working now. It is inconsistently objecting to the old build... some accepted some rejected. If you’re having problems please try downloading the newly patched build and trying that.

If you continue to have issues or want to contact me otherwise you can PM me or email me