denial of service: network overload due to an attack

My hosting provider (ovh) recently blocked my VPS due to an attack on the server. When I restored it to normal mode, I can see that something is really happening: access to the server is limited, ping results are slow and often cannot access the server, and when I try any service (ftp, ssh, http .. .), it is difficult to access it. Therefore, it looks like something like DDoS, but it probably isn't exactly a DDoS attack: my provider's staff told me something must be installed on the server.

I'm not an administrator, but I need to do something … what should I do in that case?

Denial of permissions: reading from uri ANDROID pie

Hello I am having this error works perfectly in other versions of Android, but in Android Pie it does not work. I added the permission and it still doesn't work, does anyone have any idea how to make it work?
All help is welcome.


java.lang.SecurityException: Permission Denial: reading uri content:// from pid=29478, uid=1000 requires the provider be exported, or grantUriPermission()

Manifest code


my code

fun shareIt(imagePath: File? = this.imagePath) {

    val uri = FileProvider.getUriForFile(context!!, BuildConfig.APPLICATION_ID+ ".provider", imagePath!!)

    val sharingIntent = Intent(Intent.ACTION_SEND)

    sharingIntent.type = "image/*"
    val shareBody = "APP"
    sharingIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, "MY APP")
    sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, shareBody)
    sharingIntent.putExtra(Intent.EXTRA_STREAM, uri)

    startActivity(Intent.createChooser(sharingIntent, "SHARE VIA"))

route code


Denial of service: Does a DDOS attack on an application that uses CDN first have to disable all the CDN servers involved to affect the availability of the application?

Will such a DDOS attack have to completely tear down all the CDN servers that serve the content of this application before completely damaging the source server?

The CDN provider may decide that these attacks are too expensive and affect other customers protected by the CDN that will no longer serve their domain. In this case, your domain will not be directly shot down by the attack that goes through your system, but it will be unattainable anyway.

Apart from that, your application may have errors that make it possible for few requests to cause a large load, such as causing many requests to the database or attacks of algorithmic complexity. In this case, only a few requests will be sufficient to cause a large load and will make your server inaccessible. While WAF capabilities in a CDN can protect against some attacks known as this, it cannot protect against arbitrary errors in the application.

Denial of Schengen visa due to threat to public policies, safety, health

Denial for these reasons …

One or more member states consider it a threat to the public
politics, internal security, public health as defined in article 2 (19)
of Regulation (EC) No 562/2006 (Schengen Borders Code) or the
international relations of one or more of the member states).

… means that you will need a lawyer specializing in EU law. Requesting advice from the Internet is a waste of time because the answers will be classified into one of four categories …

  • Get a lawyer
  • Do something stupid (forged passport or covert entry)
  • Jingos complaints telling you and your species to stay where you are
  • Stupid incoherent of random morons

People who have been listed as threats to the security of the area have a history that requires a long speech with a specialist and there are no other viable alternatives. The same reasoning applies to questions about the appeal of the decision. Attempting an appeal for this reason is dangerous and, in addition, runs the risk that all your things enter the public domain! See a qualified practitioner!

The professional is needed, even if the deadline for an appeal has elapsed. There are data protection laws and freedom of information laws that require local experience to navigate successfully. "Cleaning your name" is not a simple job.

Related answer: Schengen visa refusal: the justification of the purpose and conditions of the planned stay was not reliable

NOTE: To avoid the natural corollary, let's add that …

  • The consulate has already told the Department of Homeland Security in
    USA UU. that tries to mobilize;
  • The consulate has already told the other members of Schengen;
  • The consulate has informed its colonial missions abroad; Y
  • The consulate has informed the United Kingdom that it is trying to mobilize.
    and the United Kingdom in turn has informed the Republic of Ireland and the
    Commonwealth members to put a high flag in their passport.

Update April 21, 2016

The questions of phoog (whom I thank) about the possibility that this refusal arises from an erroneous identity caused an email exchange with a specialist. The result is that this reason ("One or more member states consider it a threat to public policies …") means that they had a biometric impact or some other positive conclusive coincidence. It's not like the US flight ban list where people with the same names generate confusion. Instead, it means that that person (and no one else) is in problem and it won't be fixed in the short term. Therefore, the previous answer still applies. I am taking the advanced law course in Schengen this summer and I can add another update to this answer after that.

Also note that if they cannot obtain a positive and verifiable match, they will not use this motive; instead, they will use the rejection of the Schengen visa: the justification of the purpose and the conditions of the planned stay was not reliable

Related article on how to request your transcript of the Schengen Information System: How can I find out if someone is in the Schengen Information System (SIS)? Note: Even if you find wrong information in your transcript, you will still need a skilled professional to officially delete it and restore it to its original state.

US citizens – Denial of entry into Japan because there is no visa. Can I sue the airline?

You cannot sue the airline.

Check the documentation you received when you booked your tickets. You will find somewhere a clause that explicitly states that you are responsible for making sure you have all the documentation required for your trip, including visas that may be necessary.

He hasn't said what happened after he was denied entry, but I imagine the airline took him back to his point of origin. The airline will have incurred costs in doing this, and they could also have been fined by the Japanese authorities. It is possible (but I don't know how likely) they will come to you for the money.

Question of denial of scraped content

Hello everyone, I have been with AdSense for more than 10 years, showing ads on many sites during that time. AdSense would approve almost any site until about a year ago, when they started requiring that each site be submitted and approved to show ads on the same account.

For the most part, my sites are approved, but they ran into more problems recently, and some sites were denied for the reason they claim to be "Scraped Content." The current site in question has more than 12x unique articles of 500 words, none of which is discarded from another site. Any idea what could trigger the denial of scraped content?

I use an RSS feed on some of my sites in the same niche, the source being the same. Could this be a problem? Or is the About Us page the same on some of my sites? There is a possibility that one or two featured images are one of the Google images, but I doubt that one or two copied images are the problem. Many of the shutter images I have can be found indexed in Google images used by other sites.

Any help would be great. You can send me a PM for the site URL.

United Kingdom – Denial of United Kingdom visa under V3.6

Good morning, I applied for the 2016 UK visa and presented all my documents, but they told me that my work company was false and that they put me under V3.6 and now I have a fiance in the United Kingdom and she is pregnant with our son . , she loves me in the UK on the day of her delivery and is a British citizen. Can I reapply to obtain this visa?

uk – Visa Denial

The United Kingdom has been rejected.
What this means to you
Any future UK visa application you make will be considered on your individual merits,
however, it is likely to be rejected unless the circumstances of your request change.
In relation to this decision, there is no right of appeal or right of administrative review.
The reasons for this decision are set out on the next page.
Yours sincerely,


Your visa request to visit the United Kingdom has been rejected.
How your request was considered
He applied for a visa to visit the United Kingdom.
When deciding if you meet the requirements of Appendix V: Immigration rules for visitors
(, I have considered:
• your request and any additional relevant information you have provided with it,
• your immigration history
• Oanda exchange rate (£ 1: GHS 7.65)
The decision
I have rejected your visit visa application because I am not satisfied that you comply with the
requirements of paragraph (s) 4.2 of Appendix V; Immigration rules for visitors because:
He proposes to travel to the United Kingdom for 28 days to visit his uncle and his family. I must take in
Consider your personal and financial circumstances when making my decision. Is your
responsibility to satisfy me that their circumstances are such that if they are granted permission to enter,
will comply with all the conditions attached to said permit and will leave
United Kingdom at the end of the proposed visit.
It has no own income and no significant assets of its own. Although you
has provided documents showing that he is engaged as a student in Kwame Nkrumah
University of Science and Technology, taken in the context of its broadest staff and
economic circumstances I am not satisfied that this course of study represents only one
compelling reason to leave the UK at the end of your visit.
When considering the above and note that you have no evidence of travel and compliance
With immigration procedures similar to those in the United Kingdom, I am not satisfied that
You have established that the strength of your ties, through job stability and
finance, is such that it represents an important reason for him to leave the UK after the limited
period as indicated by you. This leads me to doubt your intentions when applying to go to the United Kingdom.
Given all of the above, therefore, I am not satisfied that it is a genuine visitor
who will leave the United Kingdom at the end of their visit or who is really looking for entry for a purpose
That is allowed by visitor routes. Therefore, I have rejected your request for compliance
with Appendix V4.2 (a) and (c) of the Immigration Rules.
In relation to this decision, there is no right of appeal or right of administrative review.

United States: how to represent the L2 visa not granted due to the L1B denial in application B1


I had applied for an L1B Blanket visa and my wife attended the interview with me for an L2 visa. The general request was rejected as "not clearly approvable." My wife is now planning to apply for a B1 visa to visit the United States as part of her current job duties.


Is it necessary to report the L2 application as a denial when requesting a B1? In addition, we expect your B1 interview to take place around February 20, and we will reapply for an L1 / L2 around March 1. Is this behavior that triggers a red flag for the United States Embassy?

denial of service – Prevention of DoS attacks in NFC

There are some attack scenarios in NFC. These include, e.g. Data modification, data insertion, retransmission attacks and DoS attacks. Just to name a few.

While some of these attack scenarios are more likely than others, I wonder how to avoid a DoS attack in NFC. The key problem in the DoS attack on NFC devices is that many requests are sent and a device is overloaded, or a smartphone reads a defective or infected tag and, therefore, enters a boot loop (or simply restarts or open any application …) In the literature, DoS attacks are said to be easy to detect, this would require an active device to scan the RF field for more signals. Since the DoS attack also requires higher performance, a DoS attack can be detected.

The problem at this point is that it is nice to see an attack taking place, but the question is how to prevent a DoS attack in NFC. In the literature, I haven't found much about it, so I expect some answers here, on the subject.