Chris, Yes, we uploaded the support bundle from the current Primary to CIS and it didn't show anything of note. We have issues with uploading the support bundle for the secondary, CIS reports it is corrupt and we have a ticket open for this with Citrix. I was wondering, as I can unzip the the support bundle and all looks fine, if there was anywhere within the files were I can look and maybe see why the failover happened? thanks for the response, appreciated Simon