Application throwing 500 internal server error only when i use burp

I am performing a security testing on one application. It is throwing 500 internal server error when i intercept with burp proxy. It is working fine if i turn off the proxy. I have tried the troubleshooting tips available in Burp support center ( but no luck. This is the first time i am observing this king of behavior. Do i need to change any settings to make burp work fine.

Thanks for your answers.

Laptop internal mic and input via headphones mic is not working in Ubuntu 18.04

I have HP ProBook 4431s. My laptop internal mic doesn’t work. Even if I try use headphones and use it’s mic, I only hear noise but no sound is recorded. Input setting shows no indication when I speak into both microphones. I have tested the above mentioned things on Windows 10 to check if it’s a hardware issue but it works fine.

Ubuntu 64-bit on Windows: Error while powering on – Internal Error and – cannot find the peer process to connect to

I have a problem when using VMware Workstation 15 Player to run Ubuntu 64-bit on Windows 10.

First installation and run is alright, I can power on Ubuntu and work just fine. After I power it off once, I keep encountering the “error while powering on: internal error” or “error while powering on: cannot find the peer process to connect to”.

I have looked at the previous posts and tried running VMWare as administrator or running Services and enabled VMWare Authorization service as automatic. (VMWare Authorization Service is already running in my case, and I have also tried to stop, restart, and start it)

It is even weirder that yesterday, without doing anything extra, I can sometimes power on the machine by just repeatedly pressing the power on button. Tried a few times, and it powers on.

Because it is so irregular, I am afraid that it won’t work when I really need it to. Any advice on what I should be looking on?

Thank you in advance. Alpin

How is it possible to scan the internal network to perform lateral movement without being detected by a firewall?

How is it possible to scan the internal network to perform lateral movement without being detected by a firewall? I’m trying to do a decent scan on the internal network for days. I have a meterpreter shell, add subnet, set proxychains port 1080 and do a slow scan with nmap. I would like to know what other techniques that Pentesters use in their day to day that are effective.

WebServer is an ubuntu, but the internal network is packed with Windows and Linux machines, thus bringing a realistic environment for training. I am doing these studies in a controlled environment.

Notebook with 18.04 use internal and external monitor

Notebook in use: Acer Nitro 5 with Nvidia Geforce GTX 1060 Mobile and internal Intel graphics.

Steps taken:

  • secure boot disabled
  • installed nvidia-430 drivers

  • switch to lightdm

  • Prime uses Nvidia

With these settings I got the external monitor on HDMI working (using NVIDIA GPU), but the internal monitor of the notebook is blank. (during startup, everything is displayed on the internal monitor, but the loginscreen of lightdm and everything after it, is displayed on the external monitor.

Plug off the cable, restart and I have my internal monitor back (graphics in use: Intel).

xrandr only shows me one monitor at a time.

lspci shows both graphic cards.

How do I get them running both at the same time?

Internal Harddrive data not appearing

I have an internal 8TB harddrive to save data on and it happened now like 5 times in the last couple of months that suddenly I find the harddrive looks empty although the size is almost full. Not sure what is the problem?

Below is the entry in the /etc/fstab

/dev/sda    /media/8tb/    ext4    defaults    0    1 

Below is the output of sudo fdisk -l

Disk /dev/nvme0n1: 931,5 GiB, 1000204886016 bytes, 1953525168 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: gpt Disk identifier: AF64508D-2EF8-47BA-AF07-DFEBC571653A  Device              Start        End    Sectors   Size Type /dev/nvme0n1p1       2048    1050623    1048576   512M EFI System /dev/nvme0n1p2    1050624 1416884223 1415833600 675,1G Linux filesystem /dev/nvme0n1p3 1416884224 1953523711  536639488 255,9G Linux swap   Disk /dev/sda: 7,3 TiB, 8001563222016 bytes, 15628053168 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes 

Below is the output of sudo blkid

/dev/nvme0n1p3: UUID="1d14ca05-c2f6-4e52-b16f-1709c3a28774" TYPE="swap" PARTUUID="644cf9ce-0e5a-4827-9611-df678b14a443" /dev/nvme0n1p1: UUID="6591-97DE" TYPE="vfat" PARTLABEL="EFI System Partition" PARTUUID="b4d38793-7edd-4384-8ddf-17f17f5cca75" /dev/nvme0n1p2: UUID="a388b104-a430-49fc-bbb7-ad0545f0cb4b" TYPE="ext4" PARTUUID="9e8edd3b-7307-403d-b7ca-29fd152d0af6" /dev/nvme0n1: PTUUID="af64508d-2ef8-47ba-af07-dfebc571653a" PTTYPE="gpt" 

And this is screenshot of the disks info:

enter image description here

Web service calls return HTTP 500 Internal Server Error on my SharePoint 2013 site

I have a SharePoint site that was running without any problem. Few days ago the search stopped working with an error in the crawl log

The crawler could not communicate with the server. Check that the server is available and that the firewall access is configured correctly

From the ULS log I was able to see that the crawler is trying to call a web service _vti_bin/sitedata.asmx, but it is failing with error HTTP 500 Internal Server Error. I believe because of this failure the crawl is not working in the farm. When I tried to call other built-in webservices in SP2013 (such as lists.asmx?WSDL), I noticed that all the ASMX services have the same problem.

Can anybody please help me to figure out what is going wrong in SharePoint? I tried to see the ULS and event viewer; nothing logged there.

Is there any way I can “reinstall” the ASMX web services in SharePoint?


The web services are not working on the site collection root site. For any subsite the web services works properly. I am still confused.

Thank you

Internal design of Android app

I have an Android app which stores data in a file system. This file system synchronizes with a server when there is an internet connection available (but is designed to work without a network connection if necessary). The data is also kept in ram for fast access. See the diagram below:

enter image description here

The general idea is that app Activities access the LiveData singletons which then by some process gets synchronized with the file cache (json files).

My question is regarding the question mark in the diagram. I’m not really sure what the best pattern would be for doing this synchronization.

The JobService will send broadcasts whenever data is changed from its end so this can be used to initialize a sync. Similarly the LiveData class has its observe pattern which can be used for changes from that direction.

The question is what method to use to do this sync. I have some ideas

  • The LiveData singletons handle it themselves; a thread is started and runs the sync whenever there is a change (but I don’t know how they react if they go out of scope with an active broadcast receiver and no way to unregister it).
  • A second service which just lives to listen to broadcasts from the JobService and changes in the LiveData singletons and update accordingly.
  • Extend the Application class to handle the synchronization from there. Its lifetime should at least guarantee there are no problems with broadcasts to unloaded classes.

What would be best? Any better alternatives?