30
votes
3answers
759 views

Windows TCP Window Scaling Hitting plateau too early

Scenario: We have a number of Windows clients regularly uploading large files (FTP/SVN/HTTP PUT/SCP) to Linux servers that are ~100-160ms away. We have 1Gbit/s synchronous bandwidth at the office and ...
1
vote
1answer
397 views

Windows Server 2008 TCP connections limit

I run my own game server made in .net 4.5 on a Windows Web Server 2008 VPS. I have done some research on a problem I have. My app doesn't accept clients, if there are already 1000 clients connected. ...
3
votes
1answer
45 views

Default TCP connection backlog value in Windows

Which is the default connection backlog value for TCP in Windows? I have tried to find it but no luck. Cheers
0
votes
1answer
665 views

HTTP 502 Bad Gateway error response

I'm debugging an issue and running out of ideas. I have a server with SharePoint code hosted at port 8080 and a WCF REST service at port 8801. From another machine on the domain, I can connect to the ...
0
votes
1answer
143 views

Oracle 11g TNSLSNR LAST_ACK connection flooding

We have Windows 2k3 EE SP2 with Oracle 11.2.0.1.0 DB installed. The DB is used by different applications (including web-apps and services). From time to time, we have some problems with the web ...
2
votes
0answers
86 views

Change TCP wait for ACK timeouts in Win7/WinServer

Is there any possibility to change default wait for ACK timeout in TCP network on Windows 7 or Windows Server ? I'm using very slow network ( 1200 bps ) and want to tweak TCP. When using default ...
3
votes
1answer
428 views

Linux - TCP Source Port Reuse (and delay)

We have an application making a lot of calls to a remote web server/service. Client app is JBoss/Java on Linux (Red Hat 5), remote server is Windows 2008. There is a Cisco ACE in the way but there ...
0
votes
0answers
30 views

Catching parent application PID/name for outgoing TCP connection

I need to find the PID or application name which establishes outgoing TCP connection on remote PC. The connection is briefly closed, so I can't react to it in real time. Edit: OS is Win7 iirc.
-1
votes
1answer
93 views

Is their an official tool to tweak Windows 2008 server TCP configurations?

We are running scripts that initiates numerous TCP connections and disconnects right away. It's just to test if the remote report is opened and responsive. But we are having random strange issues ...
1
vote
1answer
103 views

Is there a Windows utility to create a TCP server to server link?

I two systems that I need to connect, but both act as servers. The first is a scale controller that does not have the ability to open a connection before sending a weight. It will send weights if a ...
3
votes
3answers
1k views

How to prevent TCP ZeroWindow on writing a large file to a Windows share?

I've been given access to a share on a Windows Server 2003 SP1 system (10.a.bbb.ccc) which is a file and printer server, and regularly large files get copied to that share. However, occasionally such ...
1
vote
1answer
2k views

What is msrpc needed for on a Windows 7 workstation

I just ran an nmap scan against our network, and many Windows 7 machines have several high ports listening with Microsoft Windows RPC. Example: Port Serv Process name 49152, msrpc [wininit.exe] ...
-1
votes
1answer
64 views

TCP Implementation in Micrsoft Windows XP + 7 [closed]

I'm looking for the TCP implementation in MS Windows, especially for Windows XP and 7 in case they are different. To be more specific, I'm interested in the following parts of the TCP implementation: ...
1
vote
1answer
110 views

Will traffic control software cause tcp packets to be dropped

I am testing our client-server applications using NetLimiter which is a traffic control software. I found that, when client is receiving files from server and I use NetLimiter to set the download rate ...
1
vote
1answer
192 views

TCP RWIN, MSS and MTU [closed]

I have been doing some reading into TCP Receive Window (RWIN), Maximum Segment Size (MSS) and Maximum Transmission Unit (MTU). Right off the bat I have some questions and I need a power user's help! ...
1
vote
1answer
62 views

Problems with connecting to TCP server

I have two PCs in the same LAN: "A1" and "A2". There is another PC in a different LAN: "B". A TCP server is listening on machine "B", port 80. From machine "A1", I can connect successfully to machine ...
1
vote
2answers
5k views

Increasing of max (more than 10) TCP Connections

I have the following problem on one of my servers: On other servers max TCP Connections is dynamical and much more higher than 10. How to increase max TCP Connections in this server in Windows ...
4
votes
1answer
168 views

How to “silence” a TCP connection in one direction?

I have 2 applications that communicate through TCP. They keep their connection through a heartbeat of 30 seconds. I need to simulate a scenario where one side fails to send this heartbeat to test the ...
0
votes
1answer
130 views

Is there software that will convert bidirectional TCP traffic from one port to another? [closed]

I have an application that needs to send and receive traffic on a certain TCP port, say 5000. The server component uses port 6000. Is there any software that will allow me to "TCP bridge" these ...
1
vote
0answers
31 views

Is there a utility for Windows that can be used to throttle network traffic/induce dropped packages?

I am attempting to simulate the behavior of my application under less than favourable conditions. Is there a tool that allows me to slow down my network connection by capping bandwidth, introducing ...
0
votes
1answer
1k views

Connecting To FMS Server Issues

I am trying to get my computer to connect to an Adobe Connect server but I have had no luck. The error that Adobe is telling me is "ERROR: FMS Server did not return correctly!" and have done some ...
-1
votes
1answer
1k views

Can i configure the tcp SYN retransmission interval?

As far as I know SYN retransmissions: with rounding they occur 1, 3, 6, 12, 24, 48, and then 64 seconds apart. I want to do this on different interval time. what is the name of this parameter? can I ...
0
votes
0answers
156 views

Why would one server be sending DUP ACK packets to one PC, which is responding with HTTP RST packets?

I'm not a network profressional, so please excuse any wrong language. I was debugging why my DNS traffic was a constant 160Kbps on our corporate network. I opened up a wireshark trace, and I see one ...
16
votes
3answers
2k views

Troubleshooting Network Speeds — The Age Old Inquiry

I'm looking for help with what I'm sure is an age old question. I've found myself in a situation of yearning to understand network throughput more clearly, but I can't seem to find information that ...
4
votes
3answers
2k views

Different versions of iperf for windows give totally different results

Measuring TCP output from a Windows client to Solaris server: WXP SP3 with iperf 1.7.0 --> returns an average around 90Mbit Same client, same server but iperf 2.0.5 for windows --> returns an average ...
1
vote
1answer
271 views

130s timeout when accessing service exposed on HTTPS through HTTP

I have windows client application and windows service hosting a web service over HTTPS (on behind it uses standard http.sys). Everything is ok except the situation where user makes a mistake and uses ...
2
votes
1answer
2k views

TCP Window Size going to 0 / Wget stops downloading?

I have a somewhat complex setup that doesn't work, and I'm struggeling quite a bit to track down the root cause. First of all the big picture: Node backend is a medium size windows azure worker role ...
0
votes
1answer
80 views

Windows XP TCP halts after burst on ZMQ channel

I have a ZMQ application the sends a high rate of data over a TCP connection upon start up. The application runs fine on Windows 7 and Server 2003, but on XP it halts shortly after connection. The app ...
2
votes
1answer
434 views

TCP buffer size analysis

Is it possible to query the current size (or some kind of graph of the buffer-size over time for that matter) of the TCP buffer of a connection? Each endpoint of a TCP connection will have a ...
3
votes
4answers
3k views

how to check connectivity to server by windows tools?

I need to check if client can connect to server on specific TCP port. Server is listening on it. Tried "telnet server_IP port" but telnet is stuck when I see that it's connected to the server. Seems ...
2
votes
2answers
3k views

Monitor loopback traffic (monitor MS TCP Loopback inteface traffic) with Microsoft Network Monitor 3.4 - possible?

I've downloaded NM 3.4 from microsoft.com and it appears that the software doesn't capture traffic on MS TCP Loopback interface. When I ping 127.0.0.1 address, NM shows no packets flowing. I've tried ...
2
votes
2answers
1k views

When does a browser send HTTP payload separately from the HTTP request?

Under what circumstances would you expect a web browser split an HTTP request into two IP packets, even if the sum of the packet sizes is still less than the maximum segment size? I would assume that ...
1
vote
2answers
670 views

Windows Server 2008 - unable to bind any TCP port

OS: Win Server 2008 RC2 Windows firewall on (no effect when off) I have suddenly been plagued by an issue in which I cannot find any similar ones with a search. I am running about 20 game servers ...
1
vote
0answers
755 views

In Windows 2008R2 there is a TCP port that is stuck LISTENING but the process that has it open is terminated?

I have a program, NC_net that allows Nagios to monitor Windows machines for various metrics and it seems to have caused a sporadic issue where when the service stops, the TCP port remains open. The ...
2
votes
2answers
648 views

Why do I see different TCP behaviour between IIS and FTP server applications on Windows 2003?

I am comparing Wireshark traces of a 10MB file download file from: the FileZilla FTP server and IIS (using HTTP) on the same Windows 2003 server. The FTP download performs faster and the trace ...
2
votes
1answer
219 views

Is there any restriction of new incoming/outgoing TCP connections/seconds in Windows?

Is there any restriction of number of new incoming/outgoing TCP connections/seconds in Windows? If so, are there any differences between Windows versions?
0
votes
1answer
86 views

What would cause a Windows 2008 server to switch destination MACs in the middle of a TCP session?

My Windows 2008 server started a TCP session talking to one destination mac address, but in the middle of the TCP session started sending packets to another destination mac address and then eventually ...
0
votes
1answer
1k views

Windows TcpNumConnections registry key

I hope this question isn't out of place here, but can anyone explain to me what the 'TcpNumConnections' registry key does? The description has me confused; I'm not sure what Microsoft means by ...
-1
votes
1answer
791 views

How to enable jumbo frame and large TCP on Windows Server 2008

I needed to enable the jumbo frame 9000 in network setting, and I have already done that. I still need to enable large TCP on Windows Server 2008, but how do I do that?
2
votes
3answers
682 views

Windows 2008 TCP Performance

Some background... I am currently building a domain drop catch application using C#. It uses a single Socket, which sends data through an SslStream. I have spent weeks on the app and I am 100% sure ...
0
votes
1answer
2k views

Windows TCP Congestion Control

I noticed doing netsh interface tcp show global that Add-On Congresion Control Provider was set to none. What does that mean exactly? I'm guessing it means it uses windows default Congestion Control? ...
2
votes
1answer
1k views

Cannot start listening on a certain TCP port, but there's nothing currently listening on it

I have Windows Service that uses a WCF service host to listen for connections on TCP port 61000. When I try to start the service, I get the error: Service cannot be started. ...
1
vote
2answers
666 views

CLOSE_WAIT keeping process alive on windows

I have several java processes running on a windows server. I have noticed from time to time when I try to kill the process it remains alive. The cause seems to be sockets in CLOSE_WAIT associated with ...
1
vote
2answers
609 views

Poor TCP loopback throughput on Windows

I measured the throughput of a locally bound TCP socket connection on my computer (Intel Q9550, 64 GB RAM, Windows XP 64 bit) using iperf. I got dissatisfying results (around 1.6 Gbit/s) each time, no ...
0
votes
1answer
149 views

No transmission via IP

I'm using netstat on Win XP to check protocol transmission details for TCP, IP, and ICMP. There is transmission only in TCP. No transmission in ICMP is understandable since it's for errors and I ...
12
votes
2answers
34k views

Which is the default TCP connect timeout in Windows?

Which is the default TCP connect timeout in Windows? There is a registry key to configure it or it's set dynamically?
2
votes
2answers
1k views

Is it possible to configure the initial window size for tcp slow start on Windows?

I need to minimize latency for sending moderate-sized messages (~100kb) from a Windows Server 2008 R2 to another machine with the same OS. Studying wireshark logs and looking at tcp graphs shows that ...
0
votes
2answers
137 views

Why proxy servers can access to my server while I can not?

So I have a server. Its up and running. It is accessible by Proxy servers. Problem is - server is accessible out of local network by its global name and not accessible inside by that name... I used ...
2
votes
1answer
692 views

TCP: Address already in use exception - possible causes for client port? NO PORT EXHAUSTION

stupid problem. I get those from a client connecting to a server. Sadly, the setup is complicated making debugging complex - and we run out of options. The environment: *Client/Server system, both ...
0
votes
1answer
722 views

Memory Pressure Protection Feature for TCP Stack - Provided by Microsoft Security Update KB967723

We've been having a lot of funky issues with some of our web based applications that allow clients to submit lot of image files to our servers. Lots of ports are used in the process. ...