[horde] FastCGI and rpc.php error with EAS

[horde at peter-b.org]

Ubuntu 12.04.3 LTS
PHP 5.3.10-1ubuntu3.9
Horde Groupware webmail edition 5.1.3



Apache/2.2.22




I’ve had the above setup working for a few weeks now, no issues, however, one niggle.




I’m seeing the following errors in the apache error log:


[Sun Jan 26 17:34:18 2014] [warn] [client 2.139.120.106] (104)Connection reset by peer: mod_fcgid: error reading data from FastCGI server
[Sun Jan 26 17:34:18 2014] [error] [client 2.139.120.106] Premature end of script headers: rpc.php
[Sun Jan 26 17:38:23 2014] [warn] [client 2.139.120.106] (104)Connection reset by peer: mod_fcgid: error reading data from FastCGI server
[Sun Jan 26 17:38:23 2014] [error] [client 2.139.120.106] Premature end of script headers: rpc.php



Frequency varies according to the number of users connected and only occurs with EAS. 




I can’t find any errors in any other log (syslog, main apache logs, EAS sync logs are all fine) and users aren’t reporting any problems, however, I don’t like having unexplained errors filling up log files!










Any pointers gratefully accepted.