Roundcube/Horde webmail and websites on FastCGI are not accessible: Connection reset by peer: mod_fcgid: error reading data from FastCGI server

Plesk for Linux kb: technical

Applicable to:

Plesk for Linux

Symptoms

Webmail

Roundcube/Horde webmail shows the following error message in a web-browser:

CONFIG_TEXT: Service Temporarily Unavailable
The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.
Apache Server at webmail.example.com Port 80

OR

CONFIG_TEXT: 500 Internal Server Error
The following messages appear in /var/log/psa-horde/psa-horde.log or /var/log/apache2/error.log:

CONFIG_TEXT: [warn] [client 203.0.113.2] (104)Connection reset by peer: mod_fcgid: error reading data from FastCGI server
[error] [client 203.0.113.2] Premature end of script headers: index.php
The following error messages may appear in /var/log/httpd/suexec_log:

CONFIG_TEXT: uid: (10021/horde_sysuser) gid: (510/510) cmd: cgi_wrapper
target uid/gid (10021/510 or 504) mismatch with directory (0/503) or program (0/0)
uid: (2523/horde_sysuser) gid: (2521/2521) cmd: cgi_wrapper
directory is writable by others: (/var/www/cgi-bin/cgi_wrapper)

OR

CONFIG_TEXT: uid: (996/roundcube_sysuser) gid: (1006/1006) cmd: cgi_wrapper
file has no execute permission: (/var/www/cgi-bin/cgi_wrapper/cgi_wrapper)

Websites on FastCGI

Websites served by the PHP FastCGI handler are not loading with a 500 error. After changing a PHP handler to PHP-FPM, websites start to work.
CGI scripts do not work on a website.
Following error messages in /var/www/vhosts/system/example.com/logs/error_log:
CONFIG_TEXT: [warn] [client 203.0.113.2] (104)Connection reset by peer: mod_fcgid: error reading data from FastCGI server
[error] [client 203.0.113.2] Premature end of script headers: index.php

Plesk migration

The following warning appears during a Plesk migration:

PLESK_WARN: WARNING:()The webmail service horde is unavailable. It will be replaced with <webmail> for the following objects: <list of domains>

Cause

Permissions on the file /var/www/cgi-bin/cgi_wrapper are incorrect.

Resolution

Connect to the server via SSH
Correct the permissions:

# chown root:root /var/www
# chmod 0755 /var/www
# chown -R root:root /var/www/cgi-bin
# chmod 0755 /var/www/cgi-bin
# chmod -R 0755 /var/www/cgi-bin/cgi_wrapper

Horde login error: Unable to get webmail password!

Comments

6 comments

Apsides Communication February 19, 2019 11:05 (Edited February 19, 2019 11:08)

Dear sir.

I do all of this but my roundcube webmail continue with error 500.

log :

[Tue Feb 19 12:07:50.761225 2019] [fcgid:warn] [pid 23206:tid 140419207698176] (104)Connection reset by peer: [client xxx.xxx.xxx.xxx:35742] mod_fcgid: error reading data from FastCGI server
[Tue Feb 19 12:07:50.761272 2019] [core:error] [pid 23206:tid 140419207698176] [client xxx.xxx.xxx.xxx:35742] End of script output before headers: index.php

Can you help me ?

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Anna Morozyuk February 19, 2019 13:06

Hello @Apsides Communication,

Alternatively, it might be caused by insufficient permissions for the /etc/passwd. Permissions should be set as in the example below:
# ls -la /etc/passwd
-rw-r--r-- 1 root root 3100 Feb 5 14:58 /etc/passwd

If permissions differ, change it with the following command:
# chmod 644 /etc/passwd

If the error remains, contact support for the help: How to submit a request to Plesk support?

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Apsides Communication February 19, 2019 13:07

Thanks for reply but issue is same.

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Anzhelika Khapaknysh February 20, 2019 07:42

@Apsides Communication,

As far as I know, you're already in touch with our Support Team. So I suggest continue the communication in the ticket.

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BROU Charles May 08, 2019 12:51

thanks it worked for me!

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Alex January 21, 2020 15:29 (Edited January 21, 2020 15:30)

This problem arose after I decided to remove outdated php versions. 7.2 and 5 from os vendor.

Re-installing them solved the issue.

Edit:

Roundcube uses PHP 7.2, so don't remove it, even if you don't use it.

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