Can't open 127.0.0.1 as client

[bp yang]

Hi,

Does anyone know why the client code return error 57:

'---------------------------------------
'No lan card is installed in the machine
'use 127.0.0.1 as host address (local host?)
'I have sucessfully ping this address
#COMPILE EXE
DEFLNG A-Z

FUNCTION PBMAIN()
hTcp = FREEFILE
TCP OPEN PORT 7 AT "127.0.0.1" AS hTcp
MSGBOX STR$(ERR)
TCP CLOSE hTcp
END FUNCTION
'--------------------------------------

and the server code work fine:
'---------------------------------------
'No lan card is installed in the machine
'so the current ip is 127.0.0.1
#COMPILE EXE
DEFLNG A-Z

FUNCTION PBMAIN()
HOST ADDR TO MyAddr
hTcp = FREEFILE
TCP OPEN SERVER ADDR MyAddr PORT 7 AS hTcp
MSGBOX STR$(ERR)
TCP CLOSE hTcp
END FUNCTION
'--------------------------------------

I use eclient.bas and echoserv.bas for testing and get
same result (server open ok and client open returns error 57)

Thanks.

Yang

------------------

[Florent Heyworth]

Hi

what OS are you using?

Cheers

Florent

------------------

[bp yang]

Thank you Florent,

The OS is WIN2000 and WIN98. same error in these two OS.

Yang.

------------------

[Florent Heyworth]

Get to a command prompt and ping 127.0.0.1. Also ping localhost.
Either of these failing means you a TCP config problem.

Can you connect to the internet from theses machines (using a modem)
for example?

Look for a the HOSTS file of your windows root directory. On NT
it is located in winnt\system32\etc. Open the HOSTS file (no extension)
and enter the following line if it isn't already:

127.0.0.1 localhost

Does that make a difference?

Cheers

Florent

------------------

[bp yang]

Florent,

There is a line 127.0.0.1 localhost in my hosts file.

The problem is I can open tcp as server but I can't connect to
the server.

The two sample program are run in the same computer.

Thank you.

Yang.

------------------

[Florent Heyworth]

I notice you do a

HOST ADDR TO MyAddr in the server part

What value does MyAddr return?

Try opening the server with

[sorry - this line should read]
TCP OPEN SERVER PORT 7 AS hTcp

instead of

TCP OPEN SERVER MyAddr PORT 7 AS hTCP

and connect with the client.

I trust that the code you're using is not the demo code
you've show above since all the server does is open a port
and then closes the connection.

In order to service clients you need to (in short):
1- OPEN THE PORT
2- use the TCP NOTIFY hTcp, ACCEPT to accept incoming connections


Use the eclient/eserver code for testing not the code you posted above
since the above can't work.

The simplest test code for the server you should try:

#COMPILE EXE
DEFLNG A-Z

FUNCTION PBMAIN()
  LOCAL szBuffer AS ASCIIZ * 100
  LOCAL MyAddr&
  
  HOST ADDR "127.0.0.1" TO MyAddr&
  
  hTcp = FREEFILE
  TCP OPEN SERVER ADDR MyAddr& PORT 7 AS hTcp
  DO
      TCP RECV hTcp, 100, szbuffer
      SLEEP 10
  LOOP
  
END FUNCTION

Cheers

Florent




[This message has been edited by Florent Heyworth (edited September 13, 2000).]

[bp yang]

I use LOCALHOST instead of 127.0.0.1, the problem solved.

Thanks.

Yang.

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