multiple roundtrips in session

[Alex Sharaz]

Some of our eduroam users have for quite some time been using EAP-TLS
on their edge devices Normally this "just works" and I've certainly
used it from various european eduroam sites quite happily.

A bit closer to home however, today one of our TLS users tried to
connect at Leeds and our end generated the following errors.

Mon Jul  9 11:17:10 2018 : Auth: (10991893) Login incorrect (eap:
rlm_eap (EAP): Aborting! More than 50 roundtrips made in session with
state 0x1235fc092001f154): [rw557 at york.ac.uk] (from client
roaming0.ja.net port 8 cli 8C-F5-A3-31-14-A8)
Mon Jul  9 11:17:53 2018 : Auth: (10992567) Login incorrect (eap:
rlm_eap (EAP): Aborting! More than 50 roundtrips made in session with
state 0xcae72df7f8d32086): [rw557 at york.ac.uk] (from client
roaming0.ja.net port 8 cli 8C-F5-A3-31-14-A8)
Mon Jul  9 11:18:37 2018 : Auth: (10993336) Login incorrect (eap:
rlm_eap (EAP): Aborting! More than 50 roundtrips made in session with
state 0xaca0155b9e94185b): [rw557 at york.ac.uk] (from client
roaming0.ja.net port 8 cli 8C-F5-A3-31-14-A8)

Don't seem to have any more info (we're running 3.0.17) and as this is
the 1st time I've seen this, not sure what to do to reproduce it.
Don't really want to run server in debug mode just on the off-chance I
might see something.

Anything I can put in the config to generate some additional logs if
it happens again ?

Rgds
A