networking – nginx "expires" randomly during public IP access

Before going into details, I especially hope that someone can give me a good way to diagnose my problem. A tool or logs that can specifically help find the problem. This seems to be a network problem, but I am not good with the network. However, this does not seem to be a nginx configuration problem, but rather a problem of public IP resolution, router or network settings, or whatever.

When I access my nginx web site through a public IP address, for example http://172.123.123.123, it works perfectly fine at first. However, if I refresh the page in the next few minutes, Chrome will stop loading the page and wait for a response from the server for 40 to 50 seconds before displaying it again. Sometimes, Chrome takes enough time to send me the message "The site can not be reached". However, if I access my server via the local IP address, http: //192.168.1.x, the timeout never stops, no blocking or any problem . Also .. even if the server takes these 40 to 50 seconds and does not respond to the http request via a public IP address, I can still access my site by local IP address without a hitch. I monitored my resources during waiting times (via ssh) and nothing went up at all. My processor is always less than 7%, the disk I / O is still low, the use of RAM, and so on.

I am currently testing with a new installation of Ubuntu 18.04 LTS Server and Nginx 1.14 with all default settings. No software firewall enabled. I use ONLY nginx, no php, database or anything else in the equation. Use the default static HTML file. I have reformatted my server 4 to 5 times and tried different distributions and versions of Nginx.

My ISP and my service are ATT Fiber. I went through the settings of my router and tried to disable the IP filter, disabled ipv6, disabled all additional / advanced options of the firewall. I've been browsing the routers logs, where it shows dropped packets, but I do not see any of my requests.

I've enabled the options to view the timing in my nginx access.log file, but that's no use, to my knowledge. I'll post it just in case.

192.168.1.254 - - [20/Jun/2019:02:30:20 +0000] "GET / HTTP / 1.1" 200 612 "-" "Mozilla / 5.0 (Windows NT 10.0; Win64; x64) AppleWebKit / 537.36 (KHTML as Gecko) Chrome / 74.0.3729.169 Safari / 537.36" request_time = 0.000 upstream_connect_time = "- "upstream_header_time =" - "upstream_response_time =" - "
192.168.1.254 - - [20/Jun/2019:02:30:20 +0000] "GET / HTTP / 1.1" 200 612 "-" "Mozilla / 5.0 (Windows NT 10.0; Win64; x64) AppleWebKit / 537.36 (KHTML as Gecko) Chrome / 74.0.3729.169 Safari / 537.36" request_time = 0.000 upstream_connect_time = "- "upstream_header_time =" - "upstream_response_time =" - "
192.168.1.254 - - [20/Jun/2019:02:30:20 +0000] "GET / HTTP / 1.1" 200 612 "-" "Mozilla / 5.0 (Windows NT 10.0; Win64; x64) AppleWebKit / 537.36 (KHTML as Gecko) Chrome / 74.0.3729.169 Safari / 537.36" request_time = 0.000 upstream_connect_time = "- "upstream_header_time =" - "upstream_response_time =" - "
192.168.1.105 - - [20/Jun/2019:02:30:25 +0000] "GET / HTTP / 1.1" 200 612 "-" "Mozilla / 5.0 (Windows NT 10.0; Win64; x64) AppleWebKit / 537.36 (KHTML as Gecko) Chrome / 74.0.3729.169 Safari / 537.36" request_time = 0.000 upstream_connect_time = "- "upstream_header_time =" - "upstream_response_time =" - "
192.168.1.105 - - [20/Jun/2019:02:30:26 +0000] "GET / HTTP / 1.1" 200 612 "-" "Mozilla / 5.0 (Windows NT 10.0; Win64; x64) AppleWebKit / 537.36 (KHTML as Gecko) Chrome / 74.0.3729.169 Safari / 537.36" request_time = 0.000 upstream_connect_time = "- "upstream_header_time =" - "upstream_response_time =" - "
192.168.1.105 - - [20/Jun/2019:02:30:26 +0000] "GET / HTTP / 1.1" 200 612 "-" "Mozilla / 5.0 (Windows NT 10.0; Win64; x64) AppleWebKit / 537.36 (KHTML as Gecko) Chrome / 74.0.3729.169 Safari / 537.36" request_time = 0.000 upstream_connect_time = "- "upstream_header_time =" - "upstream_response_time =" - "
192.168.1.105 - - [20/Jun/2019:02:30:26 +0000] "GET / HTTP / 1.1" 200 612 "-" "Mozilla / 5.0 (Windows NT 10.0; Win64; x64) AppleWebKit / 537.36 (KHTML as Gecko) Chrome / 74.0.3729.169 Safari / 537.36" request_time = 0.000 upstream_connect_time = "- "upstream_header_time =" - "upstream_response_time =" - "
192.168.1.105 - - [20/Jun/2019:02:30:27 +0000] "GET / HTTP / 1.1" 200 612 "-" "Mozilla / 5.0 (Windows NT 10.0; Win64; x64) AppleWebKit / 537.36 (KHTML as Gecko) Chrome / 74.0.3729.169 Safari / 537.36" request_time = 0.000 upstream_connect_time = "- "upstream_header_time =" - "upstream_response_time =" - "
192.168.1.105 - - [20/Jun/2019:02:30:27 +0000] "GET / HTTP / 1.1" 200 612 "-" "Mozilla / 5.0 (Windows NT 10.0; Win64; x64) AppleWebKit / 537.36 (KHTML as Gecko) Chrome / 74.0.3729.169 Safari / 537.36" request_time = 0.000 upstream_connect_time = "- "upstream_header_time =" - "upstream_response_time =" - "
192.168.1.105 - - [20/Jun/2019:02:30:29 +0000] "GET / HTTP / 1.1" 200 612 "-" "Mozilla / 5.0 (Windows NT 10.0; Win64; x64) AppleWebKit / 537.36 (KHTML as Gecko) Chrome / 74.0.3729.169 Safari / 537.36" request_time = 0.000 upstream_connect_time = "-" upstream_header_time = "-" upstream_response_time = "-"
192.168.1.105 - - [20/Jun/2019:02:30:29 +0000] "GET / HTTP / 1.1" 200 612 "-" "Mozilla / 5.0 (Windows NT 10.0; Win64; x64) AppleWebKit / 537.36 (KHTML as Gecko) Chrome / 74.0.3729.169 Safari / 537.36" request_time = 0.000 upstream_connect_time = "- "upstream_header_time =" - "upstream_response_time =" - "
192.168.1.105 - - [20/Jun/2019:02:30:29 +0000] "GET / HTTP / 1.1" 200 612 "-" "Mozilla / 5.0 (Windows NT 10.0; Win64; x64) AppleWebKit / 537.36 (KHTML as Gecko) Chrome / 74.0.3729.169 Safari / 537.36" request_time = 0.000 upstream_connect_time = "- "upstream_header_time =" - "upstream_response_time =" - "
192.168.1.105 - - [20/Jun/2019:02:30:30 +0000] "GET / HTTP / 1.1" 200 612 "-" "Mozilla / 5.0 (Windows NT 10.0; Win64; x64) AppleWebKit / 537.36 (KHTML as Gecko) Chrome / 74.0.3729.169 Safari / 537.36" request_time = 0.000 upstream_connect_time = "-" upstream_header_time = "-" upstream_response_time = "-"
192.168.1.254 - - [20/Jun/2019:02:30:41 +0000] "GET / HTTP / 1.1" 200 612 "-" "Mozilla / 5.0 (Windows NT 10.0; Win64; x64) AppleWebKit / 537.36 (KHTML as Gecko) Chrome / 74.0.3729.169 Safari / 537.36" request_time = 0.000 upstream_connect_time = "- "upstream_header_time =" - "upstream_response_time =" - "
192.168.1.254 - - [20/Jun/2019:02:30:41 +0000] "GET / HTTP / 1.1" 200 612 "-" "Mozilla / 5.0 (Windows NT 10.0; Win64; x64) AppleWebKit / 537.36 (KHTML as Gecko) Chrome / 74.0.3729.169 Safari / 537.36" request_time = 0.000 upstream_connect_time = "- "upstream_header_time =" - "upstream_response_time =" - "

The first 3 requests indicating 192.168.1.254 were made via my public IP address and passed through my router. After the 3rd request, the page stopped responding and I went to the local IP address. It worked well for the local, even though at the same time it only answered my public demands much later. All timings simply indicate 0 and – so it does not seem to help diagnose things.

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script – separating the signature and the public key in a TX message entry transaction in Bitcoin protocol

I am interested in the Bitcoin protocol and check the validation of a transaction.

in a TX message, we can see one or more input transactions and each input transaction has a previous transaction and a script.
As you probably know, the script contains two components, a signature and a public key. The public key must match the hash specified in the exchanged output script. The public key is used to verify the issuer signature, which is the second component. How can I separate the signature of the public key and in what follows, how can I validate a transaction from this public key?

email – Unable to send mail from the command line – public / pickup: no such file or directory

Try to send emails using mail (1) from the macOS terminal, the following message is displayed and the mail is not sent.

postdrop: warning: impossible to search public / pickup: no file or directory of this type

I've checked the directory where I think it should be and it's there:

root # ls -ld / var / spool / postfix / public / pickup
prw - w - w - 1 _postfix _postdrop 0 December 31, 2016 / var / spool / postfix / public / pickup

I've read that Postfix is ​​running ephemeral to send mail, but I do not know how. I do not know at all how Postfix is ​​configured on macOS. I know Postfix on Linux, but I do not know macOS.

I would just solve this problem so that my script can send an e-mail to its output.

Relevant system details:

        System Version: macOS 10.12.6 (16G29) (Sierra)
Core Version: Darwin 16.7.0

powershell – Migrate the calendar from the user's mailbox to a public folder (shared calendar) in Exchange

We use Exchange 2016. A user shares his calendar with other users via Outlook (2010, 2013). To decouple this calendar from its mailbox and make it a shared calendar, we want to bring it into a public folder, preferably with the help of PowerShell.

Until now, we have exported (without even knowing if it succeeded) the calendar with:

New-MailboxExportRequest -Mailbox a.user -IncludeFolders "# Calendar #" -FilePath \ PST  user.pst

How can we import the user.pst in a public folder?

is it possible to encrypt the message with a public key and decrypt with the same public key?

In asymmetric cryptography, is it possible to decrypt the message with the SAME PUBLIC key with which the message was encrypted? Can an encrypted message with a public key be written only with an associated private key?

Fiverr went public at $ 20 something per share

they should do it $ 5

The information about the facebook public does not work?

Hi,
I'm trying to use public knowledge on Facebook, but as soon as I open the public information page and select age groups and interests, on the right pane, page preferences, demographics, etc. display the progress bar, which continues to display it forever.

I'm not sure why he did not show the result after changing some settings on the left panel (age, interests, etc.).