How to Solve VCOM “Progressing” Problem

Applies to these models:

  • SG-B-8-L
  • SG-B-8-L-W
  • SG-B-4-L
  • SG-B-4-L-W

Problem: VCOM shows “Progressing” (pic) for more than 30 minutes after click on “add” button.

Solution: uninstall “VirtualBox Host-Only Ethernet Adapter”

Refer pictures below on how to uninstall “VirtualBox Host-Only Ethernet Adapter”.

  1. Right click on “VirtualBox Host-Only Ethernet Adapter”, then click uninstall
  2. Click OK

Note: after it is uninstalled, and VCOM is working, “VirtualBox Host-Only Ethernet Adapter” can be re-installed.

Refer pictures below on how to re-install “VirtualBox Host-Only Ethernet Adapter”.

  1. Run VirtualBox Installer as shown as “VirtualBox-5.1.28-117968-Win.exe”
  2. Click Run
  3. Click Next,
  4. Click Repair,
  5. Click Repair.
  6. After the installation finished, the “VirtualBox Host-Only Ethernet Adapter” will be appeared in Device Manager

Speed of Sending SMS Using MOBITEK MobiGATE


  • MOBITEK MobiGATE Model SG-B-8-L,  SG-B-8-L-W,
  • Maxis SIM Card;
  • MOBITEK SMS Engine — Enterprise Edition

the average sending speed is 10 SMS per minute.

The config.xml is as follow







Signal Strength

Value of +CSQ RSSI dBm Condition
2 -109 Marginal
3 -107 Marginal
4 -105 Marginal
5 -103 Marginal
6 -101 Marginal
7 -99 Marginal
8 -97 Marginal
9 -95 Marginal
10 -93 OK
11 -91 OK
12 -89 OK
13 -87 OK
14 -85 OK
15 -83 Good
16 -81 Good
17 -79 Good
18 -77 Good
19 -75 Good
20 -73 Excellent
21 -71 Excellent
22 -69 Excellent
23 -67 Excellent
24 -65 Excellent
25 -63 Excellent
26 -61 Excellent
27 -59 Excellent
28 -57 Excellent
29 -55 Excellent
30 -53 Excellent


How to Configure Sunix USB-to-Serial Converter in VirtualBox

Applies to these MobiGATE models:

  • SG-4
  • SG-8
  • SG-4-U
  • SG-8-U


  1. Goto "VirtualBox -> Settings -> USB -> USB Device Filters". Add new filter.
    Configure Sunix USB-to-Serial Converter-01
  2. Run the virtual machine.
  3. Install the USB driver for Sunix USB-to-Serial Converter (pic).
    Configure Sunix USB-to-Serial Converter-02
  4. Connect Sunix USB-to-Serial Converter to PC. It will create 4 devices “Prolific Technology …” in VirtualBox.
    Configure Sunix USB-to-Serial Converter-03
  5. The “Device Manager” in VirtualBox will also show 4 COM ports “Prolific USB-to-Serial Comm Port” have been added.
    Configure Sunix USB-to-Serial Converter-04


Note: If you skip step 1 and do not add a new “USB Device Filters”, instead you configure from "VirtualBox -> Devices -> USB" (Step 4), then there will be an error. “Failed to attach the USB device”.
Configure Sunix USB-to-Serial Converter-05

How to Change the IP Address of MobiGATE Using “update.exe”

  1. Run the program “upgrade.exe”. Download from here …
  2. Click “search all device” to find IP address of MobiGATE.
    Change the IP Address of MobiGATE-01
  3. Optional: click “connect to device” if want to connect to MobiGATE.
  4. If found, it will show a list of MobiGATE with IP address.
    Change the IP Address of MobiGATE-02
  5. Select MobiGATE (
  6. Click “Temporary change IP address”.
    Change the IP Address of MobiGATE-03
  7. Insert temporary IP address ( and click OK.
    Change the IP Address of MobiGATE-04
  8. The new temporary IP address will be updated on the list.
    Change the IP Address of MobiGATE-05
  9. Now access the web menu of MobiGATE via web browser using the temporary IP address (
    Change the IP Address of MobiGATE-06

    • Note: the MobiGATE’s IP address is still remain at the old address of
    • using “update.exe” to set a temporary IP address is temporary only, it will revert back to its old IP address after you power off the MobiGATE
    • you need to continue, using the web menu “serial port server” to permanently change the IP address according to our guide

VCOM Showing “Connected” Then “Disconnected”

Issue: VCOM shows “Connected” then “Disconnected”.

Applies To:

  • MobiGATE Model SG-B-8-L-W
  • SMS Engine version 5 and 6


  • if any modem does not have a SIM card inserted and engine is started, the engine  will try to initalise the modem, VCOM shows “Connected”
  • when the initialisation fails, VCOM shows “Disconnected”
  • refer video clip below, Modem ID 2 (COM port no. 17) has a SIM card inserted with blue LED blinking, but others do not have any SIM cards, only Modem ID 2 stays “Connected”, others will show “Connected” then “Disconnected”



Comparison Between MOBITEK MobiGATE and Modem Pool

FEATURES SMS Gateway using MOBITEK MobiGATE SMS Gateway using 4/8/16 Port Modem Pool
Concurrent Sending of SMS Yes No
1 SIM card to 1 GSM Module Yes No, shared, even though there are 16 SIM cards, but there are only 4 modules
Load Balancing
all modems sharing the load
Yes No, using round-robin rule
Fail Over
if modem fails to send out SMS, the message will be routed to 2nd modem
Yes No
Genuine Sierra Wireless Module Yes No
Support 64 bit Yes No
Rack Mountable Yes, it is 1U No



More Information