15
PROBLEMS
If requested port number for Bridge Connection is used by another program, the
TWCT.EXE program will quit working with following message.
In this case it’s necessary to change port number settings
If TWCT22 is not able to connect to TWCT.EXE program
, there could be several reasons:
1.
External connection is blocked by the local computer or remote firewall. It must be unblocked for
TWCT.EXE to work properly.
2.
Selected port number blocked by GSM card supplier's firewall. In this case it is advisable to use
the port 80 because it’s not usually blocked.
Note: If You have Skype program running it should
be closed before doing following.
In the TWCT.EXE settings window change the local
computer’s port number for Bridge Connection to 80 and click the button “Start”. Now you can
run Skype program again. Skype program uses port 80 only if it’s free. If you want to avoid Skype
using port 80 change it' behavior in Skype “Connections” tab.
3.
TWCT22 GSM card supplier doesn’t provide network service through GPRS.
4.
There is no GPRS connection.
5.
Wrong TWCT22 GPRS settings (APN, USER, PASSWORD) – usually APN.
6.
IP address of your computer is not permanent (dynamic). It can change each time you are
connecting to network and may be different from when you configured TWCT.EXE.
7.
Local computer doesn’t have external IP address and port number. In this case usually IP address
starts with 192 or 172 or 10. It happens when your computer belongs to network with NAT
(network address translation) functionality. Ask your network administrator for getting your
external IP address and port number that would be redirected to your computer.
8.
Entered Short Message text doesn‘t correspond to one generate by the TWCT.EXE.
