I am getting the same error when trying to access the quintum via TCM. The quintum is behind NAT and both ports 23 & 8080 are open.
I can telnet to both ports.
However, I am getting the following error:
“Premature EOF Encountered (Please Check the IP Address)
TCM version: Tenor_Client_CM_103.07.02_101405
Quintum model: BX
Tenor BX 
System Software P103-08-00 Oct 21 2005, 13:03:40
H323 Module : 3.1.1
Boot Software P103-00-00
Serial Number: A013-02016A
20-Channel DSP Cards: 1 [1 0 0]
120-Channel DSP Card: No
Digital Interfaces: 8 [2 2 2 2]
Database Version: DB_CMS_M09_A012_V7.0.00_080205
I appreciate if someone has seen this problem and would share the workaround or solution..
Please not this issue is only seen when using the TCM remotely.