Can ping & resolve, but can't telnet
Posted on 2009-04-09
Very weird one so bear with me;
ISP replaced Firewalls last week, but only copied config from old to new, claim no changes made.
Since then server outside the environment cannot set up smtp connection;
Can ping the server name
Can ping & resolve the domain mail.domainname.com okay
Can telnet from anywhere else on the network inside or outside the environment
It is just this one server in a seperate environment, which can ping & resolve but can't telnet on port 25
Very weird, driving us all nuts here as we cannot find why this is happening, ISP deny anything to do with Firewalls, but cannot see any other way round this?