Printer web connection problem

asked 2017-11-07 02:29:06 +0000

shhwang
3 ●3

updated 2017-11-09 16:50:53 +0000

Eddi

2379 ●8 ●48 ●59

I used to connect printer's website for usage checking,

However, sometimes I can't connect the printer's website.

I can connect target printer with telnet( port : 80 ), but, i cannot connect target printer with web browser...

...

belows are follow TCP Stream result

 GET / HTTP/1.1
 Accept: text/html, application/xhtml+xml, */*
 Accept-Language: ko-KR
 User-Agent: Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0; TCO_20170914171800)
 Accept-Encoding: gzip, deflate
 Host: 172.1.108.202
 Connection: Keep-Alive
 ...

as soon as first http message sended( GET / HTTP/1.1 .. ), TCP Retransmission and RST is occured.

and this pattern show recursively.

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Can you share a capture file showing the pattern? (s. https://blog.packet-foo.com/2016/11/t...)

Uli ( 2017-11-07 22:03:33 +0000 )edit

I upload .pcapng file.

https://www.cloudshark.org/captures/f...

Thank you in advance.!

shhwang ( 2017-11-08 06:37:52 +0000 )edit

[updated: formatting to make the HTTP request easier to read]

Eddi ( 2017-11-09 16:51:23 +0000 )edit

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answered 2017-11-09 16:59:20 +0000

Eddi

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Interesting trace file.

Most remarkable, the client is sending two identical HTTP requests over two separate TCP connections simultaneously. Pairs of the TCP connections are source ports 24409 / 244010 and 24414 / 24415. Please let us know, if this is due to some trace file sanitation, or the real behavior.

A couple of other things to look for:

What happens, if you use a different browser? This would allow us to check if the HTTP server is confused by the user-agent.
The HTTP request references an IP address. What happens, if you send the HTTP request using the hostname configured for the printer?

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It solved by 3rd-party company which deployed our network system. maybe cause by wrong configuration for routing setting. thank you.!

shhwang ( 2017-11-13 05:28:28 +0000 )edit

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answered 2017-11-09 22:29:56 +0000

mrEEde
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updated 2017-11-10 09:08:38 +0000

sindy
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You can actually connect using a browser also. Th e3-way handshake succeeds so there is an active listener at the printer. However the HTTP GET doesn't specify any file to get. I suggest you try
http://172.1.108.202/index.html
and report the results
Regards Matthias

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[http://172.1.108.202/index.html] did not work also..

shhwang ( 2017-11-13 05:27:24 +0000 )edit

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