Cannot connect to SGD server via proxy

Hello
We have a recently installed SGD server running.
Some clients have been setup today with accounts to access it but none of them can get on at the moment. The error message presented is as follows:
Cannot connect to the server sgd.ourdomain.co.uk:443
The HTTP proxy "NTLM" at devicename:8080 failed to connect to the server sgd.ourdomain.co.uk:443
The following response was returned:
HTTP/1.1 403 Forbidden
Clearly there's a proxy/firewall getting in the way.
Client has tried to connect from a network that is behind a different firewall and has been sucessful.
I'm hoping to get further details on the proxy/firewall setup but this could take a while.
Has anyone encountered this previously and if so, can any solutions be suggested.
Thanks,
Rob

Hi Team,
I am facing the same issue and I am using Oracle system user credentials to connect Oracle server and I have also installed extension pack for the SQL Server instance which i am using for migration. Still I am getting the following error in last step (Migrate
data).
Cannot connect to Oracle server via SQL Server tester extensions.
Oracle
10.2.0.4 verion
SQL Server 2012 SP1
SSMA 6.0
Please help me if you have gone through the same problem.
Thanks,
Vijaysqldb

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service sapmsXXX unknown,logon balancing,service sapdp## not found error,etc/services,drivers\etc\services,getservbyname, sapdpxx
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