Troubleshooting:

Invalid MP cert info; no signature

Failed to query http://… for MP location

Step 1) verify the mplist and mpcert

http://server.bla.com/sms_mp/.sms_aut?mplist

http://server.bla.com/sms_mp/.sms_aut?mpcert

if you get the cert page and mp list the mp is working

https://technet.microsoft.com/en-us/library/Bb932118.aspx?f=255&MSPPError=-2147217396