Steve,
I started building on the centralized reflector(s)
The first reflector was no problem. Its up and working.
The second reflector nothing can connect to it. I see in the logs of the repeater that it is connecting to reflector 2 (102x3) but then it times out.

I have noticed that once a device fails connection to a reflector that there are no further retries.  I have to do a restart on P25gateway to reattempt.

I can't find anything in the Docs files as to the port 42010. I found this first layout in documentation.

102x2 Reflector                                                                                                                                           310xx7
P25_Ref <->   P25Gtw       <->   MMDVM_Br   <->  An_Br_P25    <->  An_Br_DMR  <->  MMDVM_Br   <-> BrandMeister
                                                     P25
  41000   -->  41000 32010  -->  32010 34103  -->  34103 34001  --> 34001 31100  -->  31100 62032 --> 62032
  42010  <--   42010 42020  <--  42020 34100  <--   34100 32001 <-- 32001 31103  <--   31103 62031 <-- 62031
                                                   DMR
                                                   31100
                                                   31103

102x3 Reflector                                                                                                                                          310xx9
P25_Ref  <->       P25Gtw    <->   MMDVM_Br   <->   An_Br_P25    <->   An_Br_DMR   <->  MMDVM_Br   <-> BrandMeister
                                                    P25                                                                                      DMR 
  41010   -->  41010   32110  -->  32110  34203 -->  34203  34101  -->  34101 31200  -->  31200 62132  -->  62132
  XXXXX <--  XXXXX  42120 <--   42120  34200 <--  34200  32101  <--  32101 31203  <--  31203 62131  <--  62131
                                                   DMR                                                                                      P25
                                                  31200                                                                                    34203
                                                  31203                                                                                    34200