Crlf keep alive monitoring

Koivusalo nokia. Date Thread. Hi Rohan, To start with I have to apologize that I have not been able to attend the latest IETF meetings and will not be able to make it for the next meeting either. That said I try to be reasonable in my posts to the mailing lists even if I am not totally happy to the fact that these issues were raised already in March but will not be addressed before the end of June.

Last year Outbound was considered urgent and many WG members wanted it to be finished as soon as possible, but recently the push to get it out seems to have vanished somewhere. Maybe there has been something more urgent gaining the focus.

crlf keep alive monitoring

I was able to find a note in the IETF68 SIP meeting minutes for this, however I am not able to grasp the value of this indicator unless it is supposed to carry a value for the timers, but how could the server know the keepalive times of the NATs between the UA and proxy? What I am worried about all this is that it seems to make the machinery quite complex. My preference would be to keep things simple as creeping complexity seems to be a common problem for SIP and its extensions. To me it seems that introduction of various flags like "timed-keepalive", "keep-stun" and "keep-crlf" will in the end have similar effect to the complexity, which is not probably justified by the value gained.

I even fail to see how those flags would really help any battery operated mobile device. After this email from Cullen in the end of March I was expecting to see a bit different solution in the next version of the Outbound draft as suggested by me and Christer to what Cullen agreed : 1.

The proxy would indicate its Outbound support e. When UA knows the supported transports from DNS and Outbound support from Path header it can be sure that the proxy supports all keepalive methods Outbound has specified for those transports. Defined like that all the other flags "timed-keepalive", "keep-stun" and "keep-crlf" could be removed from the draft. I do not see enough value for those flags which seem to a enable the proxy to support just one keepalive method for TCP; and b somehow complex negotiation between UA and proxy whether regular keepalive or heartbeat messages are expected.

Any comments to this proposal? If you find it acceptable, could you please incorporate it either within the next version of the Outbound draft or raise it as an open question for the meeting to decide? Hide Navigation Bar.Ordinarily, you'd be at the right spot, but we've recently launched a brand new community website For the community, by the community. Take Me to the Community! In order to participate you must be a registered DNNizen. It has extensive logging and detailed graphs for the results as well.

Included our latest Portal Keeper release is a bot that provides the actual service. There is a corresponding user bot as well, which means you can let your portal users have dedicated bots with a list of urls to monitor, each with different schedules, rough statistics and a response time threshold for email alerts. We're planning to have an online platform inwith several user bots available, and keep alive monitoring will definitely be amongst the free services.

In the mean time, everyone should feel free to instantiate the module and propose the service around. Also included in the module is a Keep Alive page adapter that enhances the corresponding. Download DNN Platform. DNN Modules.

DNN Themes. Store Blog. Evoq Preferred. Evoq Content. Content Management System. Test Drives. Content Management. DNN Partners. Partner Directory. Ask a Question. DNN Store. New Community Website Ordinarily, you'd be at the right spot, but we've recently launched a brand new community website Give it a go and let me know if you have any suggestions for improvements. Rgds David.The HTTPRequest node interacts with a web service, using all or part of the input message as the request that is sent to that service.

You can also configure the node to create an output message from the contents of the input message, augmented by the contents of the web service response, before you propagate the message to subsequent nodes in the message flow.

The node receives the response from the web service, and parses the response for inclusion in the output tree. The node generates HTTP headers if they are required by your configuration.

The data to be sent to the web service can be the whole, or a portion of, the message tree, as specified in the HTTPRequest node properties. The reply can replace the input message, or be inserted into the message tree; the location is specified in the HTTPRequest node parameters. If the request is successful, the HTTPResponse is inserted into the front of the message tree, the reply placed in the specified location in the tree, and the request propagated to the Out terminal.

If the HTTPRequest node is not able to issue the request, an ExceptionList is inserted into the message tree and the tree is propagated to the Failure terminal. You can specify a timeout interval, so that if the request takes longer than the specified duration, the request is propagated to the Failure terminal with an appropriate message. For each request that the HTTPRequest node processes, it opens a connection, and then closes it when the response is returned.

If the timeout interval is specified, the socket is closed after the interval. This closure ensures that a request gets only the correct response, and any response data for a request that has timed out is discarded. You can use the HTTP proxy to route a request through an intermediate site. You can run tools as a proxy to see the request and the response, and therefore debug your flows.

The HTTP destination is as seen by the proxy; if you specify the HTTP destination of localhost, and the HTTP proxy is running on a different computer, the request is routed to the remote proxy computer, not the computer from which the original request was issued. The most common example is a message flow that calls a web service. For more information about web services, see Processing Web service messages. For more information, see Providing credentials for outbound requests by using IWA.

If the node detects these errors, it generates an exception, populates the exception list with the error information that is received, and routes the input message unchanged to the Failure terminal.

The reply is produced as a BLOB message because the node cannot determine in what format the reply will be. If you have not configured this node to handle redirection, messages with a redirection status code 3xx are also handled in the same way. The HTTPRequest node treats the series status codes as a 'continue' response, discards the current response, and waits for another response from the web server.AWS shuts down a tunnel if it detects 10 or more seconds of inactivity.

The solution is to set a keep alive or a ping that will ping the tunnel IP every 5 seconds. Currently the ping monitor limits the ping interval to 1 min. I would like to see if it can be changed to 5 seconds. Thanks for giving the details of your requirement. Its an interesting one. I understand you want to keep the tunnel alive by pinging the tunnel IP so that it feels that some traffic is constantly coming in and thus keeping it alive.

I would assume its not necessary that you need this from different locations Correct me if I'm wrong. We don't support this at the moment.

crlf keep alive monitoring

However, let me get back after some discussion internally. New Topic. Go to All Forums Nave. Keep Alive monitoring. Here's my scenario and the need. Like 1 Reply. Jasper Pa. Re: Keep Alive monitoring.

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Dear Nave. Like 0 Reply. Note : You are not currently logged in. You can still post if you wish, but you will neither be able to receive any email updates nor will we be able to contact you to help you out.

Cancel Submit. Was this post helpful? This topic is great This topic can improve. Sorry to hear that. Let us know how we can improve this post. Submit Cancel. Thanks for taking the time to share your feedback. We'll use your feedback to improve our community. Statistics 1 Replies.Release S-CX6. Rather the SBC manipulates SIP registration requests and responses to the endpoint — causing it to issue frequent and extraneous registration requests thus maintaining existing NAT bindings.

Section 3. The Indication of Support for Keep-Alive internet draft addresses this deficiency by defining a procedure that enables a SIP endpoint to signal its capability and willingness to send and receive periodic keep-alive messages to a device referred to by the RFC as an edge proxy, a role performed by the SBC.

After receiving such a signal, the SBC returns a response indicating its willingness to exchange keep-alives, and specifying the frequency of the exchange. SIP endpoints that initiate and participate in the keep-alive exchanges described in this section must support a minimal sub-set of client operations. Binding request and response formats are described in Section 6 of RFC The expires parameter in the Contact header requests a registration period of 5 hours seconds.

The expires parameter in the Contact header grants a registration period of 1 hour seconds. The SBC, forwards the OK to the endpoint after inserting a keep parameter and a parameter value in the Via header of the Registration response. If keep-alive renegotiation is not successful, the endpoint must cease the transmission of keep-alive messages.

In the absence of an expected request, the SBC takes no action with regard to the TCP connection, or to established sessions. Previous Next JavaScript must be enabled to correctly display this content. In the absence of an explicit assignment, this attribute defaults to a value of 30 seconds.Joinsubscribers and get a daily digest of news, geek trivia, and our feature articles.

Windows 10 normally puts your laptop into low-power sleep mode when you close the lid. This can be a problem when hooking your laptop up to an external monitor. If you do this, be careful! Your laptop will continue to run, wasting its battery and potentially even overheating in your bag. There are two separate options here: On Battery and Plugged In.

You can choose different options for each. The settings you choose will be associated with your Windows power plan. You should now be able to close the lid on your laptop without it going into sleep mode. Comments 0. The Best Tech Newsletter Anywhere. Joinsubscribers and get a daily digest of news, comics, trivia, reviews, and more. Windows Mac iPhone Android. Smarthome Office Security Linux.

The Best Tech Newsletter Anywhere Joinsubscribers and get a daily digest of news, geek trivia, and our feature articles. Skip to content. How-To Geek is where you turn when you want experts to explain technology. Since we launched inour articles have been read more than 1 billion times. Want to know more?Slow HTTP attacks rely on the fact that the HTTP protocol, by design, requires requests to be completely received by the server before they are processed. If an http request is not complete, or if the transfer rate is very low, the server keeps its resources busy waiting for the rest of the data.

If the server keeps too many resources busy, this creates a denial of service. These types of attack are easy to execute because a single machine is able to establish thousands of connections to a server and generate thousands of unfinished HTTP requests in a very short period of time using minimal bandwidth.

Recent rumors indicate these attacks are happening right now: CIA.

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To detect a slow headers a. The request sent to the first connection consists of a request line and one single header line but without the final CRLF, similar to the following:. The request sent to the second connection looks identical to the first one, but WAS sends a follow-up header line some interval later to make the HTTP server think the peer is still alive:.

Currently that interval is approximately 10 seconds plus the average response time during the crawl phase. WAS considers the server platform vulnerable to a slowloris attack if the server closes the second connection more than 10 seconds later than the first one. In that case, the server prolonged its internal timeout value because it perceived the connection to be slow.

Using a similar approach, an attacker could occupy a resource thread or socket on that server for virtually forever by sending a byte per T — 1 or any random value less than Twhere T is the timeout after which the server would drop the connection. WAS does not report the server to be vulnerable if it keeps both connections open for the same long period of time more than 2 minutes, for exampleas that would be a false positive if the target server were IIS which has protection against slow header attacks, but is less tolerant of real slow connections.

To detect a slow POST a. Similar to the slow headers approach, WAS sends an identical request to the second connection, and then 10 seconds later sends the following again without the final CRLF :.

WAS assumes that if the server blindly accepts that request, e. Multiplying by the T — 1 would give you the length of time an attacker could keep that connection open. QID is reported on detection of that behavior. Tests performed by WAS are passive and as non-intrusive as possible, which minimizes the risk of taking down the server.

But because of the possibility of false positives, care should be taken, especially if the HTTP server or IPS Intrusion Prevention System is configured to change data processing behavior if a certain number of suspicious requests are detected.

If you are interested in active testing, which might take your server down, you can try some active testing using one of these available tools:. Hi, I was reading this article and have few doubts.

crlf keep alive monitoring

It would be great if you can you please clarify these. In this case why is it OK to have second request complete within 10 second later than the first one. In ideal scenario both connection should be closed at the same time as they were created at the same time and server should keep track of the time the first request was received in any connection and then close it after some interval of time which should be independent of the subsequent requests sent to it like we did in second connection.

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