If you have more than 1 cache-ex user, check this config:
[account]
user = bigcar
pwd = bigcar
group = 20
uniq = 3
cacheex = 3
allowedprotocols = camd35
[account]
user = smallcar
pwd = smallcar
group = 21
uniq = 3
cacheex = 3
allowedprotocols = camd35
[account]
user = verysmallcar
pwd = verysmallcar
group = 22
uniq = 3
cacheex = 3
allowedprotocols = camd35
[reader]
label = bigcar
protocol = camd35
device = ddd.zapto.org,12222
user = asdasdasd
password = asdasdasdads
cacheex = 3
group = 5,6,10,21,22
dropbadcws = 1
[reader]
label = smallcar
protocol = camd35
device = xx.dyndns.ws,56666
user = xx
password = xxx
cacheex = 3
group = 5,6,10,20,22
dropbadcws = 1
[reader]
label = verysmallcar
protocol = camd35
device = xx.dyndns.ws,60000
user = xxx
password = xxx
cacheex = 3
group = 5,6,10,20,21
dropbadcws = 1