HMRC and Government Gateway URLs
IRIS Earnie IQ
Configuring a firewall.
The following URLs must be permitted to enable electronic communication with HMRC and the Government Gateway.
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                                www.govtalk.gov.uk 
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                                www.hmrc.gov.uk 
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                                secure.gateway.gov.uk (Note full address begins with https:\\) 
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                                Anything secure or un-secure to ‘….gateway.gov.uk’ 
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                                https://secure.gateway.gov.uk/submission 
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                                https://secure.gateway.gov.uk/submission/ggsubmission.asp 
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                                https://dps.ws.hmrc.gov.uk/dpsauthentication/service 
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                                https://dps.ws.hmrc.gov.uk/dps/service 
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                                https://secure.gateway.gov.uk/soap/2007/02/Public/Public.asmx 
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                                https://transaction-engine.tax.service.gov.uk/submission 
Access must be granted for all items beginning with the text stated above plus subsidiary items, such as
www.govtalk.gov.uk  would permit www.govtalk.gov.uk/taxation/MOV, www.govtalk.gov.uk/CM/gms-x and so forth..
Ports 80 and 443 must be opened for bi-directional communication.