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One interesting thing to note is that the article doesn’t mention Netscaler version 12.1 as affected, but my guess is that nothing has changes between 12.0 and 12.1 regarding above (ie you still need to run above command to resolve it).įeel free to email me at or leave a message here on this blog post, if you have any questions or comments. value is 216 (or 65,536) bytes for the entire packet, including header and data. See for more info regarding the rc.netscaler file.Īfter the change, you can see how from below picture that only one packet is sent. This field is a 16 bit integer, so the max. ![]() ![]() To resolve this through Netscaler, run the following command in shell on Netscaler, nsapimgr_wr.sh -ys arg1=0 -ys arg2=1 -ys arg3=16 -ys call=”set_sso_post_data_handler”. You have to run the command on all Netscaler nodes (if HA/Cluster) and you also have to put this command line in the file /nsconfig/rc.netscaler, otherwise the change will be lost on the next Netscaler reboot. Wireshark http content length software#The solution is to either have the backend software rewritten to handle above case, or to run a special Netscaler command which will disable the split-post-packet-into-two-packets behaviour. To monitor HTTP traffic including request and response headers and message body from a. IP adress 10.200.40.159 is a SNIP and 10.200.41.131 is the backend server hosting the web application. (Note that Wireshark can also use tcpdump capture filters. See picture below of the WireShark capture showing the two packets. TLS: Server Hello Wireshark v3 supports ssl and tls filters, not just ssl 2 TLS: TLS Encrypted Alert (followed by FIN, it’s probably a connection close) 21 TLS: Target server contains badsite in server name contains 'badsite'. If and only if the media type is not given by a Content-Type field, therecipient MAY attempt to guess the media type via inspection of its content and/or the. Multi-platform: Runs on Windows, Linux, macOS, Solaris, FreeBSD, NetBSD, and many others. Wireshark http content length code#The backend code in this case is unable to handle the initial 0 length POST packet, and therefore crashes or bugs out before processing the second, real packet. The HTTP 1.1 spec, RFC 2616, says in section 7.2.1 'Type': Any HTTP/1.1 message containing an entity-body SHOULD include a Content-Type header field defining the media type of that body. Wireshark has a rich feature set which includes the following: Deep inspection of hundreds of protocols, with more being added all the time. In these cases the backend web applications have all been quite old and not exactly well-written coding-wise.īy default when AAA is activated on Netscaler, any large POST packet sent to the LB vServer, and subsequently to the backend, will be split up into two packets with the first one having a Content-Length header value of 0 and the secondary packet containing the correct Content-Length header value and the actual POST body. Recently while working with two customers and setting up load balancing and external access to some of their applications, I’ve encountered issues with large POST packets (either large form submits or file uploads in the web app) stop working when AAA is activated on the load balancing (LB) vServer. : Other By Rasmus Kindberg Translate with Google ⟶ ![]()
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