[horde] Problem uploading large attachments

[Arjen de Korte]

I'm not sure if this is something new (imp-6.1.4), but I just noticed  
that I can't upload pictures anymore. The following is logged:

[Wed Aug 28 21:03:12 2013] [error] [client 192.168.1.121] request body  
exceeds maximum size (131072) for SSL buffer, referer:  
https://example.com/horde/imp/dynamic.php?page=compose&type=new&token=u7uyNeVyEAmznWm0uivcTA4&uniq=1377716554752
[Wed Aug 28 21:03:12 2013] [error] [client 192.168.1.121] could not  
buffer message body to allow SSL renegotiation to proceed, referer:  
https://example.com/horde/imp/dynamic.php?page=compose&type=new&token=u7uyNeVyEAmznWm0uivcTA4&uniq=1377716554752

Anyone an idea where to look? Google isn't helping here, since all I  
could find that this occurs when client certificates are used (which I  
don't) in certain circumstances.
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