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WAF & 2012r2 RDG issue

Louis-M

Real strange issue with WAF.

Using a DNAT to our RDG server works without issue. Change it to WAF (no profile) and we can't get it to go and we end up with this in the logs:

2018:09:11-19:18:03 gw01-2 httpd: id="0299" srcip="XXX.XXX.XXX.XXX" localip="YYY.YYY.YYY.YYY" size="13" user="-" host="XXX.XXX.XXX.XXX" method="RPC_IN_DATA" statuscode="401" reason="-" extra="-" exceptions="-" time="14330" url="/rpc/rpcproxy.dll" server="remote.mydomain.com" port="443" query="?localhost:3388" referer="-" cookie="-" set-cookie="-" uid="W5gG2la8xLYAAFfUEsgAAAAG"
2018:09:11-19:18:03 gw01-2 httpd: id="0299" srcip="XXX.XXX.XXX.XXX" localip="YYY.YYY.YYY.YYY" size="13" user="-" host="XXX.XXX.XXX.XXX" method="RPC_OUT_DATA" statuscode="401" reason="-" extra="-" exceptions="-" time="14463" url="/rpc/rpcproxy.dll" server="remote.mydomain.com" port="443" query="?localhost:3388" referer="-" cookie="-" set-cookie="-" uid="W5gG21a8xLYAAFfUEsoAAAAH"
2018:09:11-19:18:23 gw01-2 httpd[22484]: [proxy_http:error] [pid 22484:tid 4079676272] (70007)The timeout specified has expired: [client XXX.XXX.XXX.XXX:32850] AH01095: prefetch request body failed to 10.1.28.175:443 (10.1.28.175) from XXX.XXX.XXX.XXX ()

 

Any idea? It works if we go to /RDWeb so the certificates etc are all fine. It's just the full RDP that doesn't work with WAF but is fine with DNAT.



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  • 0 in reply to BAlfson

    Came back to this with a fresh head as it was doing my nut in.

    To cut a long story short, this was what was showing up in the logs:

    2018:11:12-20:16:15 gw03-1 httpd[20854]: [proxy_msrpc:error] [pid 20854:tid 4103662448] (70007)The timeout specified has expired: [client xxxxxxx:55654] RPC_OUT_DATA: failed to read request body - ap_get_brigade
     
    And the issue was...... The Common Threats Filter!
     
    Now, you would think the logs would show that ie warning - pattern match xxxxxx filter. But no, nothing was registering as it did when I enabled the common threats filter and made an exception for each error as you normally do to tighten things down.
     
    Long story short and moral of the story - strip the config right back to basics and start again and don't believe what it's showing/not showing you.
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