doc: siplify troubleshooting, link to reference docs, reorder
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# Troubleshooting
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# Troubleshooting
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## Browser
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### Redirection issues (HTTP Referer)
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Depending on its configuration and installed plugins, the browser may remove or alter (spoof) HTTP referers, thus preventing Shaarli from properly redirecting between pages.
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See:
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- [HTTP referer](https://en.wikipedia.org/wiki/HTTP_referer) (Wikipedia)
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- [Improve online privacy by controlling referrer information](http://www.ghacks.net/2015/01/22/improve-online-privacy-by-controlling-referrer-information/)
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- [Better security, privacy and anonymity in Firefox](http://b.agilob.net/better-security-privacy-and-anonymity-in-firefox/)
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### Firefox HTTP Referer options
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HTTP settings are available by browsing `about:config`, here are the available settings and their values.
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`network.http.sendRefererHeader` - determines when to send the Referer HTTP header
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- `0`: Never send the referring URL
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- not recommended, may break some sites
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- `1`: Send only on clicked links
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- `2` (default): Send for links and images
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`network.http.referer.XOriginPolicy` - Cross-domain origin policy
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- `0` (default): Always send
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- `1`: Send if base domains match
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- `2`: Send if hosts match
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`network.http.referer.spoofSource` - Referer spoofing (~faking)
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- `false` (default): real referer
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- `true`: spoof referer (use target URI as referer)
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- known to break some functionality in Shaarli
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`network.http.referer.trimmingPolicy` - trim the URI not to send a full Referer
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- `0`: (default): send full URI
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- `1`: scheme+host+port+path
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- `2`: scheme+host+port
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### Firefox, localhost and redirections
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`localhost` is not a proper Fully Qualified Domain Name (FQDN); if Firefox has
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been set up to spoof referers, or only accept requests from the same base domain/host,
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Shaarli redirections will not work properly.
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To solve this, assign a local domain to your host, e.g.
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```
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127.0.0.1 localhost desktop localhost.lan
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::1 localhost desktop localhost.lan
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```
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and browse Shaarli at http://localhost.lan/.
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Related threads:
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- [What is localhost.localdomain for?](https://bbs.archlinux.org/viewtopic.php?id=156064)
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- [Stop returning to the first page after editing a bookmark from another page](https://github.com/shaarli/Shaarli/issues/311)
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## Login
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## Login
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### I forgot my password!
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### I forgot my password!
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@ -69,12 +10,19 @@ Delete the file `data/config.json.php` and display the page again. You will be a
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Login form is protected against brute force attacks: 4 failed logins will ban the IP address from login for 30 minutes. Banned IPs can still browse links.
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Login form is protected against brute force attacks: 4 failed logins will ban the IP address from login for 30 minutes. Banned IPs can still browse links.
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To remove the current IP bans, delete the file `data/ipbans.php`
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- To remove the current IP bans, delete the file `data/ipbans.php`
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- To list all login attempts, see `data/log.txt` (succesful/failed logins, bans/lifted bans)
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### List of all login attempts
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## Browser issues
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The file `data/log.txt` shows all logins (successful or failed) and bans/lifted bans.
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### Redirection issues (HTTP Referer)
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Search for `failed` in this file to look for unauthorized login attempts.
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Depending on its configuration and installed plugins, the browser may remove or alter (spoof) [HTTP referers](https://en.wikipedia.org/wiki/HTTP_referer), thus preventing Shaarli from properly redirecting between pages. Referer settings are available by browsing `about:config` and are documented [here](https://wiki.mozilla.org/Security/Referrer). `network.http.referer.spoofSource = true` in particular is known to break some functionality in Shaarli.
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### Firefox, localhost and redirections
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`localhost` is not a proper Fully Qualified Domain Name (FQDN); if Firefox has been set up to spoof referers, or only accept requests from the same base domain/host,
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Shaarli redirections will not work properly. To solve this, assign a local domain to your host, e.g. `localhost.lan` in your [hosts file](https://en.wikipedia.org/wiki/Hosts_(file)) and browse Shaarli at http://localhost.lan/.
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## Hosting problems
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## Hosting problems
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@ -123,10 +71,11 @@ This can be caused by several things:
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- You may be using OperaTurbo or OperaMini, which use their own proxies which may change from time to time.
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- You may be using OperaTurbo or OperaMini, which use their own proxies which may change from time to time.
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- If you have another application on the same webserver where Shaarli is installed, these application may forcefully expire php sessions.
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- If you have another application on the same webserver where Shaarli is installed, these application may forcefully expire php sessions.
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### Old apache versions, Internal Server Error
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If you hosting provider only provides apache 2.2 and no support for `mod_version`, `.htaccess` files may cause 500 errors (Internal Server Error). See [this workaround](https://github.com/shaarli/Shaarli/issues/1196#issuecomment-412271085).
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## Sessions do not seem to work correctly on your server
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## Sessions do not seem to work correctly on your server
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Follow the instructions in the error message. Make sure you are accessing shaarli via a direct IP address or a proper hostname. If you have **no dots** in the hostname (e.g. `localhost` or `http://my-webserver/shaarli/`), some browsers will not store cookies at all (this respects the [HTTP cookie specification](http://curl.haxx.se/rfc/cookie_spec.html)).
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Follow the instructions in the error message. Make sure you are accessing shaarli via a direct IP address or a proper hostname. If you have **no dots** in the hostname (e.g. `localhost` or `http://my-webserver/shaarli/`), some browsers will not store cookies at all (this respects the [HTTP cookie specification](http://curl.haxx.se/rfc/cookie_spec.html)).
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## Old apache versions, Internal Server Error
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If you hosting provider only provides apache 2.2 and no support for `mod_version`, `.htaccess` files may cause 500 errors (Internal Server Error). See [this workaround](https://github.com/shaarli/Shaarli/issues/1196#issuecomment-412271085).
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