Hi,
We had the same problem (timeout) starting screen painter on a SAPGUI client pc.
The issue coud be solved by adding the missing sapgw00, sapgw01, etc. entries in the services file located at the \windows\system32\drivers\etc directory on the SAPGUI client pc.
>> services
sapgw00 3300/tcp
sapgw01 3301/tcp
sapgw02 3302/tcp
sapgw03 3303/tcp
sapgw04 3304/tcp
sapgw05 3305/tcp
sapgw06 3306/tcp
sapgw07 3307/tcp
sapgw08 3308/tcp
....
sapgw99 3399/tcp
<<
Kind regards
Peter