Hi Paul, > (60) Trust-Router-COI := 'ligo.communities.moonshot.ja.net' > (60) GSS-Acceptor-Realm-Name := 'astro.cardiff.ac.uk' > (60) Event-Timestamp = 'Aug 6 2015 11:04:42 BST' > (60) NAS-IP-Address = 10.73.1.254 I suspect it's this. The NAS-IP-Address attribute between the two requests differs as well: > (58) Trust-Router-COI := 'ligo.communities.moonshot.ja.net' > (58) GSS-Acceptor-Realm-Name := 'astro.cardiff.ac.uk' > (58) Event-Timestamp = 'Aug 6 2015 11:03:42 BST' > (58) NAS-IP-Address = 131.251.184.56 I'm assuming that the 10.73.*.* address is an internal host. Does that IP address resolve to the same, i.e. gw005.astro.cf.ac.uk? If not, then that may be a reason why the request may be rejected. I would look on the IdP side, i.e. on moonshot-idp.cf.ac.uk what the error is. With Regards Stefan Paetow Moonshot Industry & Research Liaison Coordinator t: +44 (0)1235 822 125 gpg: 0x3FCE5142 xmpp: [log in to unmask] skype: stefan.paetow.janet Lumen House, Library Avenue, Harwell Oxford, Didcot, OX11 0SG jisc.ac.uk Jisc is a registered charity (number 1149740) and a company limited by guarantee which is registered in England under Company No. 5747339, VAT No. GB 197 0632 86. Jisc’s registered office is: One Castlepark, Tower Hill, Bristol, BS2 0JA. T 0203 697 5800. Jisc Collections and Janet Ltd. is a wholly owned Jisc subsidiary and a company limited by guarantee which is registered in England under Company No. number 2881024, VAT No. GB 197 0632 86. The registered office is: Lumen House, Library Avenue, Harwell, Didcot, Oxfordshire, OX11 0SG. T 01235 822200.