Good morning,
This is just something we've been seeing at random times since moving to GW 2014 :
In GWMON, when looking at the status, on a random MTA, it will show a Blue Circle with an "I" (letter I as in Instruction) and report No HTTP, it still appears to be updating the status of the MTA, as it shows Status Duration - which is updating, shows no closed links nor messages being queued, I assume this is an informational type message/error, but does this have something to do with the http user name and or password that it's either getting from the startup file, or the GAC not being the same?
This appears to be random, as I just checked the GWMon a few days back, and everything was all Green. 
Thank you for any thoughts or assistance,