It appears this was simply a configuration issue. The default setting of min threads was 1, changing this to a higher setting (2 was enough) appears to have resolved the issue. The maximum was set to 1000, I never tested this configuration before because I guessed Varnish would simply start an extra thread.
In other words, the command line parameter from "-w 1,1000,120" to "-w 2,1000,120" was enough to stop the 'Resource temporarily unavailable messages'. We'll obviously adjust this configuration further as required. Thanks -- Bradley Falzon [email protected] _______________________________________________ varnish-misc mailing list [email protected] https://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc
