[snip]
   But we have hit one snag that is just...weird.  Either of the two 
RSX-11M-PLUS machines that we've tried (an 11/70 and an 11/53) both do 
this.  From one specific terminal server, when we connect to the LAT 
service, it gets a connection (and LCP shows it as connected) but there 
is no login prompt.  It is completely unresponsive.
   The other two terminal servers work just fine, and other machines 
(several VAXen, two Linux machines, etc) can connect to that LAT service 
just fine, meaning we get the ">" immediately and can log in.
My RSX-11M-PLUS configuration for LAT is bog standard (and all my
LAT services are in group 0)
$ lcp show char
 
LCP Node Characteristics
     Node name = /RUSTY/
     Node identification = /SIMH PDP-11/93 (RUSTY)/
     Service name = /RUSTY/
     Service identification = /RSX11M-Plus V4.6/
     Group codes 0
     Multicast timer = 20          Maximum buffers = 3
     Receive timeout = 30          Retransmit timer = 3
     Terminals = 4
     LAT Version = 5.1             LAT Protocol is active
I don't remember changing the Lantronix settings either
Local_2> sh server char
   ETS8P Version V3.6/5(010208)           Uptime:          156 Days  04:55
   Hardware Addr: 00-80-a3-67-18-8b       Name/Nodenum:           GECKO/ 0
   Ident String: Lantronix Terminal Server (GECKO)       Daytime: 11:23:42
LAT  Circuit Timer (msec):         80     Password Limit:                3
   Inactive Timer (min):           30     Console Port:                  1
   Queue Limit:                    32     Retrans Limit:                25
   Keepalive Timer (sec):          20     Session Limit:                 4
   Multicast Timer (sec):          30     Node/Host Limits:      (none)/20
TCP/IP Address:         192.168.42.43     Subnet Mask:       255.255.255.0
   Nameserver:         192.168.42.253     Backup Nameserver:192.168.42.252
   TCP/IP Gateway:       192.168.42.1     Backup Gateway:     192.168.42.1
   Domain Name:           LOCALDOMAIN     IP Time:                 Daytime
                                          TCP Keepalives:          Enabled
   DHCP Server:                  None     Lease Time:                 0:00 
   Prompt:                Local_%n%P>     Network Buffering:          2048
   Groups: 0
   Characteristics:  Announce  Broadcast  Lock  
   Incoming Logins:  Telnet   (Passwords Required)
Local_2> 
   Do you have any thoughts on this?
Nothing springs to mind at this stage.   In my "working life" I managed a fleet of
DECservers (200/MC, 90, 500), Vista VCP 1000 and Lantronix using TSM - and had these
operating on a campus LAN and with LAT bridged over slow speed WAN links (9600bps)
back in the day.
Tony