I am running exchange 2003 on sbs and trying to deploy rpc over http, I have done one deployment in the past but this one has my at a loss. When I attempt to access /rpc I am continuously prompted for credentials When I attempt to access /rpc/rpcproxy.dll I get prompted for credentials, and I can authenticate then I get a 503 service unavailable page. Not sure what to do at this point ..

Regarding authentication. How is /RPC directory configured? Verify settings and value of validpiorts http://technet.microsoft.com/en-us/library/aa997495(EXCHG.65).aspx At the end of this article there is links to several other places, follow them for more steps to verify. lasse at humandata dot se, http://anewmessagehasarrived.blogspot.com

Hi, Please use the RPCping to test the RPC over HTTP : 1. Download the and install RPCping on your external client. http://www.microsoft.com/downloads/details.aspx?FamilyID=9d467a69-57ff-4ae7-96ee-b18c4790cffd&DisplayLang=en 2. Run the following command to verify if the the client is able to connect to proxy server without problem: rpcping -t ncacn_http -s YourExchMBXServer -o RpcProxy=YourRPCProxyServer -P "user,domain,PASSWORD" -I "user,domain,PASSWORD" -H 1 -u 10 -a connect -F 3 -v 3 -E -R none Note: Replace YourExchMBXServer with the FQDN of your exchange server , replace YourRPCProxyServer with the FQDN of your IIS proxy server. -H, This argument is the authentication type that is used for the RPC Proxy server. Use the value 1 for basic authentication, and use the value 2 for NTLM authentication. - F, These arguments are the flags that pass for RPC/HTTP front end authentication. The No SSL flag is 2, and the Use SSL flag is 3. the RPC Ping Utility test was successful, you will receive the following reply: RPCPinging proxy server ExchServer with Echo Request Packet Sending ping to server Response from server received: 200 Pinging successfully completed in Response_Time ms Then move to next step to test if the external client can connect to the validports on the mailbox server: 3. Type: rpcping -t ncacn_http -s YourExchMBXServer -o RpcProxy=YourRPCProxyServer -P "user,domain,PASSWORD" -I "user,domain,PASSWORD" -H 1 -u 10 -a connect -F 3 -v 3 -e:6001 rpcping -t ncacn_http -s YourExchMBXServer -o RpcProxy=YourRPCProxyServer -P "user,domain,PASSWORD" -I "user,domain,PASSWORD" -H 1 -u 10 -a connect -F 3 -v 3 -e:6002 rpcping -t ncacn_http -s YourExchMBXServer -o RpcProxy=YourRPCProxyServer -P "user,domain,PASSWORD" -I "user,domain,PASSWORD" -H 1 -u 10 -a connect -F 3 -v 3 -e:6004 If the RPC Ping Utility test was successful, you will receive the following reply: Completed 1 calls in xxx ms If you receive any errors, please post it here for further research. More information about the usage of RPCping, please refer the following article: http://support.microsoft.com/kb/831051

Any update on the issue?Gulab | MCITP: Exchange 2010-2007 | Lync Server 2010 | Windows Server 2008 | Skype: Exchange.Ranger | Blog: www.ExchangeRanger.Blogspot.com