Hi Peterpan,
Lets start with basics.
Can you ping the server with servername and IP address?
Do you know on which port have you installed SEPM?
Can you telnet to the server on that port? e.g. telnet 10.205.153.25:8014 [ assuming sepm is installed on port 8014]?
If the answer to all the above answers is a yes, then you can do a secars test by etering the following in internet explorer
http://10.0.2.2:8014/secars?hello,secars
if you see "OK" as the output, then the SEPM is able to accept the connections just fine.
Let us know the results of the above tests mentioned.
Best,
Aniket