A German computer magazine was writing about this observation last week and asked eBay for a statement.
eBay's answer was:
There is some widely spread software that is either Malware or legit software which can be miss-used to steal the eBay password. This software is listening on certain TCP ports.
By trying to establish a connection to these TCP ports, the (JavaScripts of the) eBay web site tries to find out if such software is currently running.
There is some widely spread software that is either Malware or legit software which can be miss-used to steal the eBay password. This software is listening on certain TCP ports.
By trying to establish a connection to these TCP ports, the (JavaScripts of the) eBay web site tries to find out if such software is currently running.