nginx serving corrupt images
Saint Michael
venefax at gmail.com
Fri Feb 24 03:29:50 UTC 2023
I enabled http2 but it fails
nginx: [emerg] the "http2" parameter requires ngx_http_v2_module in
/etc/federico/x3x.conf:17
On Thu, Feb 23, 2023 at 10:25 PM Saint Michael <venefax at gmail.com> wrote:
> can we add that at the top level? like a global value?
>
>
> On Thu, Feb 23, 2023 at 10:17 PM Dan Swaney <justdan23 at gmail.com> wrote:
>
>> See my earlier response above for details. It works when you reduce the
>> ssl_buffer_size to 4k. You can try 8k for performance.
>> (Correction: use the 'server' section for this setting.)
>>
>> server {
>> ...
>> ssl_buffer_size 4k;
>> }
>>
>> Reference to setting is on this page:
>>
>> https://haydenjames.io/nginx-tuning-tips-tls-ssl-https-ttfb-latency/
>>
>>
>> The bug happens to be within the OpenSSL library I believe, but I found
>> when reducing the buffer size to 4k, it worked for my test.
>> There is a bug when it operates with the default of 16k and it fails to
>> write out the response in 16k chunks, but does work with 4k chunks.
>>
>> On Thu, Feb 23, 2023 at 10:06 PM Saint Michael <venefax at gmail.com> wrote:
>>
>>> Please read this, it's from 2011/11/04, and it hasn't been fixed :
>>>
>>> https://tech.blog.aknin.name/2011/11/04/nginxgzip-module-might-silently-corrupt-data-upon-backend-failure/
>>>
>>>
>>> On Thu, Feb 23, 2023 at 9:43 PM Dan Swaney <justdan23 at gmail.com> wrote:
>>>
>>>> Ah-ah...I caught the NGINX failure in the SSL response:
>>>>
>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 http filename:
>>>>> "./html/images/image001.jpg"
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 add cleanup: 000002DC83A7CBE8
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 http static fd: 732
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 http set discard body
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 http map started
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 parse header: "Cookie:
>>>>> SessionId SessionId="
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 http map started
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 http map: "" ""
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 http script var: ""
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 http map: "" ""
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 http script copy: "SessionId
>>>>> SessionId="
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 http script var: ""
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 http script copy: ";AuthId="
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 http script var: "SessionId
>>>>> SessionId="
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 http script copy: "
>>>>> SessionId="
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 http script var:
>>>>> "ab3e389a16b819b5477309665cfcc4672f47d5657e1c154381c6eb8336963721"
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 http script copy: "; Domain=
>>>>> win10-web-svr.dreamstone.com; Path=/; HttpOnly; Secure"
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 HTTP/1.1 200 OK
>>>>> Server: nginx/1.23.3
>>>>> Date: Fri, 24 Feb 2023 02:24:49 GMT
>>>>> Content-Type: application/octetstream
>>>>> *Content-Length: 123197*
>>>>> Last-Modified: Wed, 30 Nov 2022 19:41:21 GMT
>>>>> Connection: keep-alive
>>>>> ETag: "6387b1e1-1e13d"
>>>>> Strict-Transport-Security: max-age=15768000; preload
>>>>> X-Frame-Options: SAMEORIGIN
>>>>> X-XSS-Protection: 1
>>>>> X-Content-Type-Options: nosniff
>>>>> Referred-Policy: strict-origin
>>>>> Set-Cookie: SessionId SessionId=;AuthId=SessionId SessionId=
>>>>> SessionId=ab3e389a16b819b5477309665cfcc4672f47d5657e1c154381c6eb8336963721;
>>>>> Domain=win10-web-svr.dreamstone.com; Path=/; HttpOnly; Secure
>>>>> Accept-Ranges: bytes
>>>>>
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 write new buf t:1 f:0
>>>>> 000002DC83A7E2F0, pos 000002DC83A7E2F0, size: 626 file: 0, size: 0
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 http write filter: l:0 f:0
>>>>> s:626
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 http output filter
>>>>> "/images/image001.jpg?"
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 http copy filter:
>>>>> "/images/image001.jpg?"
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 malloc:
>>>>> 000002DC83A87340:32768
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 http postpone filter
>>>>> "/images/image001.jpg?" 000002DC83A7E658
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 write old buf t:1 f:0
>>>>> 000002DC83A7E2F0, pos 000002DC83A7E2F0, size: 626 file: 0, size: 0
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 write new buf t:1 f:0
>>>>> 000002DC83A87340, pos 000002DC83A87340, size: 32768 file: 0, size: 0
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 http write filter: l:0 f:1
>>>>> s:33394
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 http write filter limit
>>>>> 2097152
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 malloc:
>>>>> 000002DC83A8F350:16384
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 SSL buf copy: 626
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 SSL buf copy: 15758
>>>>> *2023/02/23 21:24:49 [debug] 4768#4528: *1 SSL to write: 16384*
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: ssl remove session: B87DD7B9:32
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: shmtx lock
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: shmtx unlock
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 SSL_write: -1
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 SSL_get_error: 1
>>>>>
>>>>> *2023/02/23 21:24:49 [crit] 4768#4528: *1 SSL_write() failed (SSL:
>>>>> error:0A0C0103:SSL routines::internal error) while sending response to
>>>>> client, client: 192.168.80.130, server: win10-web-svr.dreamstone.com
>>>>> <http://win10-web-svr.dreamstone.com>, request: "GET /images/image001.jpg
>>>>> HTTP/1.1", host: "win10-web-svr.dreamstone.com
>>>>> <http://win10-web-svr.dreamstone.com>", referrer:
>>>>> "https://win10-web-svr.dreamstone.com/
>>>>> <https://win10-web-svr.dreamstone.com/>"*2023/02/23 21:24:49 [debug]
>>>>> 4768#4528: *1 http write filter FFFFFFFFFFFFFFFF
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 http copy filter: -1
>>>>> "/images/image001.jpg?"
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 http finalize request: -1,
>>>>> "/images/image001.jpg?" a:1, c:1
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 http terminate request
>>>>> count:1
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 http terminate cleanup
>>>>> count:1 blk:0
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 http posted request:
>>>>> "/images/image001.jpg?"
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 http terminate handler
>>>>> count:1
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 http request count:1 blk:0
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 http close request
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 http log handler
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 run cleanup: 000002DC83A7CBE8
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 file cleanup: fd:732
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 free: 000002DC83A87340
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 free: 000002DC83A7BC00,
>>>>> unused: 0
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 free: 000002DC83A7DC20,
>>>>> unused: 1167
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 close http connection: 500
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 select del event fd:500
>>>>> ev:768
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 reusable connection: 0
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 free: 000002DC83A647C0
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 free: 000002DC83A8F350
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 free: 000002DC8332EAB0,
>>>>> unused: 12
>>>>> 2023/02/23 21:24:49 [debug] 4768#4528: *1 free: 000002DC83A7DA10,
>>>>> unused: 384
>>>>>
>>>>
>>>> On Thu, Feb 23, 2023 at 9:32 PM Dan Swaney <justdan23 at gmail.com> wrote:
>>>>
>>>>> I tried to reproduce it with a simple web page and I'm seeing the
>>>>> issue which I believe you are having.
>>>>>
>>>>> By default, NGINX seems to default to some limit of 15k on responses
>>>>> of images returned directly.
>>>>>
>>>>> While the error.log in debug mode shows it constructs the response
>>>>> with the right content length, it fails to return a response if the file is
>>>>> over 15k.
>>>>>
>>>>> I'm using a build I did from NGINX 1.23.3. While I know I have
>>>>> returned files larger than this in proxy mode. This seems to be happening
>>>>> in normal web server page mode.
>>>>>
>>>>> [image: image.png]
>>>>>
>>>>>
>>>>> I even tried to increase it by adding:
>>>>>
>>>>> location / {
>>>>>> root html;
>>>>>> index index.html index.htm favicon.ico;
>>>>>>
>>>>>> types {
>>>>>> text/html html;
>>>>>> image/gif gif;
>>>>>> application/octetstream jpg;
>>>>>> application/octetstream png;
>>>>>> }
>>>>>>
>>>>>> set $max_image_size 50000;
>>>>>> client_max_body_size 50000;
>>>>>> }
>>>>>>
>>>>>
>>>>> On Thu, Feb 23, 2023 at 8:09 PM Dan Swaney <justdan23 at gmail.com>
>>>>> wrote:
>>>>>
>>>>>> Try this:
>>>>>>
>>>>>> 1. At the very top of your nginx.conf file, add a definition:
>>>>>>
>>>>>> error_log logs/error.log debug;
>>>>>>
>>>>>> 2. Within your nginx install directory (where nginx.exe exists),
>>>>>> create a 'logs' folder if one does not exist.
>>>>>> 3. Restart nginx.exe (if running as a Windows Service with NSSM,
>>>>>> then restart the service).
>>>>>> 4. If NGINX does not start...
>>>>>> - Check the 'error.log' as it will tell you if your nginx.conf
>>>>>> has something weird in it that it doesn't like.
>>>>>> 5. If NGINX started successfully...
>>>>>> - Run your test from your client browser.
>>>>>> - Go back to the Server and check your 'error.log' and look
>>>>>> for the URL request.
>>>>>> - It will show you everything it does with routing or looking
>>>>>> for files.
>>>>>>
>>>>>>
>>>>>> On Thu, Feb 23, 2023 at 7:22 PM Saint Michael <venefax at gmail.com>
>>>>>> wrote:
>>>>>>
>>>>>>> Now it remains broken and I have no idea how to fix it. I guess is
>>>>>>> caching bad copies of the pictures.
>>>>>>> I re-uploaded the two images.
>>>>>>> Kindly let me know if this is "normal"
>>>>>>> [image: image.png]
>>>>>>>
>>>>>>> On Thu, Feb 23, 2023 at 7:08 PM Dan Swaney <justdan23 at gmail.com>
>>>>>>> wrote:
>>>>>>>
>>>>>>>> Now your image001.jpg is returning your home page:
>>>>>>>> [image: image.png]
>>>>>>>>
>>>>>>>> If I had to guess, your location routing is re-routing all sub-urls
>>>>>>>> to your base URL at '/' which is defaulting to your index.html (or whatever
>>>>>>>> you have set for your default).
>>>>>>>> The tip was when it returns the content type as 'text/html' instead
>>>>>>>> of 'image/jpg'.
>>>>>>>>
>>>>>>>> As Maxim cited, your 'location' directives are for routing URL
>>>>>>>> paths and not files. Think of the external viewed URL and the internal
>>>>>>>> routed URL location.
>>>>>>>>
>>>>>>>> Looking at your previous cited partial nginx.conf:
>>>>>>>>
>>>>>>>> - root /static/duc/;
>>>>>>>> - I usually define this in my 'location' base section only
>>>>>>>> and drop the initial '/' if it is relative to where NGINX is running.
>>>>>>>> - I then don't need it in any other 'location' sections
>>>>>>>> for sub-folders which have different security.
>>>>>>>> - You have it defined in your 'server' section.
>>>>>>>>
>>>>>>>>
>>>>>>>> - default_type 'text/html; charset=UTF-8';
>>>>>>>> - I usually define this at the top of my 'http' section.
>>>>>>>> - Normally I use 'default_type application/octet-stream;'
>>>>>>>> - You have it defined in your 'server' section.
>>>>>>>> - I see it returning your images as 'text/html'.
>>>>>>>>
>>>>>>>> - try_files $uri $uri/ /index.html;
>>>>>>>> - I usually define a default 'index' if at the root and nothing
>>>>>>>> else is added.
>>>>>>>> - For example: 'index index.html;'
>>>>>>>> - Remove the try_files like recommended earlier.
>>>>>>>> - If you need to restrict access to specific folder URL
>>>>>>>> mappings, then define a location of the URL mapping and add one line...
>>>>>>>> - 'deny all;'
>>>>>>>> - Otherwise leave it open to all sub URLs by doing
>>>>>>>> nothing more but use a single 'location /' rule.
>>>>>>>>
>>>>>>>>
>>>>>>>> On Thu, Feb 23, 2023 at 6:15 PM Dan Swaney <justdan23 at gmail.com>
>>>>>>>> wrote:
>>>>>>>>
>>>>>>>>> I just ran your test and it works fine from Chrome and in Visual
>>>>>>>>> Studio Code:
>>>>>>>>>
>>>>>>>>> > wget https://x3x.us/index_files/image001.jpg
>>>>>>>>>> StatusCode : 200
>>>>>>>>>> StatusCode : 200
>>>>>>>>>> StatusDescription : OK
>>>>>>>>>> Content : {255, 216, 255, 224...}
>>>>>>>>>> RawContent : HTTP/1.1 200 OK
>>>>>>>>>> Connection: keep-alive
>>>>>>>>>> Strict-Transport-Security: max-age=31536000;
>>>>>>>>>> includeSubDomains
>>>>>>>>>> Accept-Ranges: bytes
>>>>>>>>>> Content-Length: 8834
>>>>>>>>>> Content-Type: image/jpeg
>>>>>>>>>> Date: Thu, 23 Feb 2023 23...
>>>>>>>>>> Headers : {[Connection, keep-alive],
>>>>>>>>>> [Strict-Transport-Security, max-age=31536000; includeSubDomains],
>>>>>>>>>> [Accept-Ranges, bytes],
>>>>>>>>>> [Content-Length, 8834]...}
>>>>>>>>>> RawContentLength : 8834
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> [image: image.png]
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On Wed, Feb 22, 2023 at 7:36 PM Saint Michael <venefax at gmail.com>
>>>>>>>>> wrote:
>>>>>>>>>
>>>>>>>>>> a) The error does not have a single line.
>>>>>>>>>> b) restarting does not fix it
>>>>>>>>>> c) my nginx is no acting as proxy
>>>>>>>>>> d) it happened twice and both times I fixed it by turning gzip
>>>>>>>>>> off, restarting, and back on.
>>>>>>>>>> e) I also noticed that I requested the image file with wget, get
>>>>>>>>>> a full HTML file for the whole document, but named as if it were the image
>>>>>>>>>> file.
>>>>>>>>>>
>>>>>>>>>> wget https://x3x.us/index_files/image001.jpg
>>>>>>>>>> but `stat image001.jpg' showed it was the entire text HTML file.
>>>>>>>>>>
>>>>>>>>>> http {
>>>>>>>>>> client_max_body_size 1500M;
>>>>>>>>>> include mime.types;
>>>>>>>>>> # default_type application/octet-stream;
>>>>>>>>>>
>>>>>>>>>> #log_format main '$remote_addr - $remote_user [$time_local]
>>>>>>>>>> "$request" '
>>>>>>>>>> # '$status $body_bytes_sent "$http_referer" '
>>>>>>>>>> # '"$http_user_agent"
>>>>>>>>>> "$http_x_forwarded_for"';
>>>>>>>>>>
>>>>>>>>>> #access_log logs/access.log main;
>>>>>>>>>> sendfile on;
>>>>>>>>>> tcp_nopush on;
>>>>>>>>>> tcp_nodelay on;
>>>>>>>>>> gzip on;
>>>>>>>>>> gzip_vary on;
>>>>>>>>>> gzip_min_length 10240;
>>>>>>>>>> gzip_proxied expired no-cache no-store private auth;
>>>>>>>>>> gzip_types text/plain text/css text/xml text/javascript
>>>>>>>>>> application/x-javascript application/xml;
>>>>>>>>>> gzip_disable "MSIE [1-6]\.";
>>>>>>>>>> #keepalive_timeout 0;
>>>>>>>>>> keepalive_timeout 65;
>>>>>>>>>> types_hash_max_size 2048;
>>>>>>>>>> proxy_headers_hash_max_size 1024;
>>>>>>>>>> proxy_headers_hash_bucket_size 128;
>>>>>>>>>> #gzip on;
>>>>>>>>>> # error_log /var/log/nginx/error.log debug;
>>>>>>>>>>
>>>>>>>>>> error_log /var/log/nginx/error.log error;
>>>>>>>>>> error_log /var/log/nginx/error.log crit;
>>>>>>>>>>
>>>>>>>>>> access_log /var/log/nginx/access.log;
>>>>>>>>>>
>>>>>>>>>> server {
>>>>>>>>>> add_header Strict-Transport-Security "max-age=31536000;
>>>>>>>>>> includeSubDomains" always;
>>>>>>>>>> default_type 'text/html; charset=UTF-8';
>>>>>>>>>> listen 208.78.161.6:80;
>>>>>>>>>> server_name x3x.us;
>>>>>>>>>>
>>>>>>>>>> # Redirect all domains to https://x3x.us
>>>>>>>>>> if ($scheme != "https") {
>>>>>>>>>> return 301 https://x3x.us$request_uri;
>>>>>>>>>> }
>>>>>>>>>> }
>>>>>>>>>>
>>>>>>>>>> server {
>>>>>>>>>> add_header Strict-Transport-Security "max-age=31536000;
>>>>>>>>>> includeSubDomains" always;
>>>>>>>>>> default_type 'text/html; charset=UTF-8';
>>>>>>>>>> listen 208.78.161.6:443 ssl;
>>>>>>>>>> server_name x3x.us;
>>>>>>>>>>
>>>>>>>>>> ssl_certificate /etc/letsencrypt/live/x3x.us/fullchain.pem;
>>>>>>>>>> ssl_certificate_key /etc/letsencrypt/live/x3x.us/privkey.pem;
>>>>>>>>>>
>>>>>>>>>> root /static/duc/;
>>>>>>>>>>
>>>>>>>>>> location / {
>>>>>>>>>>
>>>>>>>>>> try_files $uri $uri/ /index.html;
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> }
>>>>>>>>>>
>>>>>>>>>> } #server
>>>>>>>>>>
>>>>>>>>>> } #http
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On Wed, Feb 22, 2023 at 7:17 PM Maxim Dounin <mdounin at mdounin.ru>
>>>>>>>>>> wrote:
>>>>>>>>>>
>>>>>>>>>>> Hello!
>>>>>>>>>>>
>>>>>>>>>>> On Wed, Feb 22, 2023 at 02:46:29PM -0500, Saint Michael wrote:
>>>>>>>>>>>
>>>>>>>>>>> > It's not a misconfiguration, is a huge bug.
>>>>>>>>>>> > A wasted two days of sleep for something that is 100% a bug.
>>>>>>>>>>> > Please read here:
>>>>>>>>>>> >
>>>>>>>>>>> https://laracasts.com/discuss/channels/general-discussion/homestead-nginx-serving-wrong-images-and-only-cut-in-the-middle
>>>>>>>>>>> > He mentions the same exact problem and also he points to
>>>>>>>>>>> >
>>>>>>>>>>> https://tech.blog.aknin.name/2011/11/04/nginxgzip-module-might-silently-corrupt-data-upon-backend-failure/
>>>>>>>>>>> > where the author says that Niginx will not fix it.
>>>>>>>>>>> > So he already tried he was rebuffed.
>>>>>>>>>>>
>>>>>>>>>>> The fun fact is that the referenced article doesn't state "will
>>>>>>>>>>> not fix", but rather "not a top priority". Further, proper
>>>>>>>>>>> error
>>>>>>>>>>> propagation is available in nginx for about 10 years now, since
>>>>>>>>>>> 2013 (http://hg.nginx.org/nginx/rev/d3eab5e2df5f, nginx
>>>>>>>>>>> 1.5.3).
>>>>>>>>>>> Quoting CHANGES:
>>>>>>>>>>>
>>>>>>>>>>> *) Change: now after receiving an incomplete response from a
>>>>>>>>>>> backend
>>>>>>>>>>> server nginx tries to send an available part of the
>>>>>>>>>>> response to a
>>>>>>>>>>> client, and then closes client connection.
>>>>>>>>>>>
>>>>>>>>>>> As long as nginx have an information about an error, it will
>>>>>>>>>>> preserve this information and propagate it to the client.
>>>>>>>>>>>
>>>>>>>>>>> Also note that it is only expected to make a difference if you
>>>>>>>>>>> are
>>>>>>>>>>> using nginx as a proxy, not to directly serve files. And only
>>>>>>>>>>> in
>>>>>>>>>>> case of errors. That is, if you are seeing the behaviour
>>>>>>>>>>> described, it might be a good idea to focus on the errors in the
>>>>>>>>>>> first place.
>>>>>>>>>>>
>>>>>>>>>>> I don't think it's anyhow related though, as switching gzip off
>>>>>>>>>>> and back on, as seems to be "the fix" described in the first
>>>>>>>>>>> link,
>>>>>>>>>>> is not going to help with anything. The important part is
>>>>>>>>>>> likely
>>>>>>>>>>> "restarted the server", so I would rather assume that "the
>>>>>>>>>>> server"
>>>>>>>>>>> (not sure if it refers to nginx or the whole server) was using
>>>>>>>>>>> an
>>>>>>>>>>> incorrect configuration and/or was out of some resources, and
>>>>>>>>>>> restart fixed it.
>>>>>>>>>>>
>>>>>>>>>>> Summing the above, if you want to find out what goes wrong in
>>>>>>>>>>> your
>>>>>>>>>>> case - you may want to provide more details. If you don't,
>>>>>>>>>>> nobody
>>>>>>>>>>> will be able to do it, unfortunately.
>>>>>>>>>>>
>>>>>>>>>>> The most basic thing I would recommend in the first place is to
>>>>>>>>>>> look into nginx error log, it is likely to contain important
>>>>>>>>>>> information if something goes wrong.
>>>>>>>>>>>
>>>>>>>>>>> --
>>>>>>>>>>> Maxim Dounin
>>>>>>>>>>> http://mdounin.ru/
>>>>>>>>>>> _______________________________________________
>>>>>>>>>>> nginx mailing list
>>>>>>>>>>> nginx at nginx.org
>>>>>>>>>>> https://mailman.nginx.org/mailman/listinfo/nginx
>>>>>>>>>>>
>>>>>>>>>> _______________________________________________
>>>>>>>>>> nginx mailing list
>>>>>>>>>> nginx at nginx.org
>>>>>>>>>> https://mailman.nginx.org/mailman/listinfo/nginx
>>>>>>>>>>
>>>>>>>>> _______________________________________________
>>>>>>>> nginx mailing list
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>>>>>>>>
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>>>>>>>
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