The port name is illegal or couldn't be connected to the device

Question

I'm getting the mentioned error when trying to claim the Epson TM-T88V ticket printer.
I have installed:

OPOS ADK for .NET
POS for .NET v1.12

I was printing fine from my latop for many days and from another computer, both working fine. I then decided to take both machines where the printer will be working. And from then on I get the above error.

Hope for somebody to shine some light, would be very helpfull.
Thanks

Update:
After executing the health check utillity I get this error:
================== Exception ===================== Microsoft.PointOfService.PosControlException ErrorCode : Illegal (106) ErrorCodeExtended : 0 Message : PortHandler Win32 error. Target : Void Claim(Int32)

StackTrace

at jp.co.epson.upos.core.v1_11_0001.pntr.CommonPrinterService.Claim(Int32 iTimeout) at CheckHealthTest.MainForm.ExecuteCheckHealth(DeviceInfo objInfo) at CheckHealthTest.MainForm.btnCheckHealth_Click(Object sender, EventArgs e) ---------InnerException----------- jp.co.epson.pos.comm.v2_0001.CommControlException Message : PortHandler Win32 error. Target : Void ThrowCommException(Int32, System.String)

StackTrace

at jp.co.epson.pos.comm.v2_0001.CommonPortIO.ThrowCommException(Int32 iError, String strMessage) at jp.co.epson.pos.comm.v2_0001.PortHandlerIO.ThrowJNIErrorException(Int32 JNIErrorID) at jp.co.epson.pos.comm.v2_0001.PortHandlerIO.PortOpen() at jp.co.epson.pos.comm.v2_0001.PortControl.OpenPort() at jp.co.epson.upos.core.v1_11_0001.pntr.CommonPrinterService.OpenPort()

After, uninstalling the Epson Advanced drivers and running a health check I get the following exception:

ErrorCodeExtended : 1001 Message : The port name is illegal, or couldn't be connected to the device. Target : Void Claim(Int32)

StackTrace

en jp.co.epson.upos.core.v1_11_0001.pntr.CommonPrinterService.Claim(Int32 iTimeout) en CheckHealthTest.MainForm.ExecuteCheckHealth(DeviceInfo objInfo) en CheckHealthTest.MainForm.btnCheckHealth_Click(Object sender, EventArgs e) ---------InnerException----------- jp.co.epson.pos.comm.v2_0001.CommControlException Message : The port name is illegal. Target : Void ThrowCommException(Int32, System.String)

StackTrace

en jp.co.epson.pos.comm.v2_0001.CommonPortIO.ThrowCommException(Int32 iError, String strMessage) en jp.co.epson.pos.comm.v2_0001.CommonPortIO.ThrowCommException(Int32 iError) en jp.co.epson.pos.comm.v2_0001.PortHandlerIO.PortOpen() en jp.co.epson.pos.comm.v2_0001.PortControl.OpenPort() en jp.co.epson.upos.core.v1_11_0001.pntr.CommonPrinterService.OpenPort()

Solution

If the printer test using the Epson Check Health Utility is reporting errors (like you've previously mentioned), this is not a fault of EPOS-Excel. This simply means that the Epson OPOS driver is not configured correctly for your printer. Once the Check Health Utility reports an "ok" test result, EPOS-Excel should have no problem using the printer.

Do you use the the Epson OPOS driver installed and NOT the "Epson Advanced Printer Driver"?