Admin Login Issue - Joomla! Forum - community, help and support

hi,
i have joomla website built on 1.5.26 , noticing weird error administration login. when login correct username/password gives me error "username or password incorrect" when refresh page, logs in directly.

same when logout, login page when put uname/pass, invalid login , visit url again login, see 2 login sessions username indicating never logged out.

what can issue here?

regards,
neel

most issue related browser. try different browser/system ruleout issue installation. please let know browser version using.