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Initial PDU

Hi,

Today I came accross very strang issue,

Our customers accessing our T.S servers with Rdgateway, today one of them could not access the server. we have configure the Rdgateway with WAF and as far as I can see it has Always worked. I did check the WAF log and see this strange entry:

2017:07:10-14:46:06 securitysrv1-1 reverseproxy: [Mon Jul 10 14:46:06.138158 2017] [proxy_msrpc:error] [pid 23892:tid 4078795632] [client 91.XX.XX.4:7449] RPC_OUT_DATA: server 10.0.10.202:443 (10.0.10.202) did not accept initial PDU (HTTP status code 401)

and this one:

2017:07:10-14:46:06 securitysrv1-1 reverseproxy: [Mon Jul 10 14:46:06.142053 2017] [proxy_msrpc:error] [pid 23892:tid 4087188336] [client 91.XX.XX.4:62701] RPC_IN_DATA: Failed to sync Outlook Session 036be2ca-ced4-b8f2-c99d-eda5ad38e1b8: 2
2017:07:10-14:46:06 securitysrv1-1 reverseproxy: [Mon Jul 10 14:46:06.142065 2017] [proxy_msrpc:error] [pid 23892:tid 4087188336] [client 91.XX.XX.4:62701] RPC_IN_DATA: The registered Outlook Session 036be2ca-ced4-b8f2-c99d-eda5ad38e1b8 is in unexpected state 'BROKEN'

Why should this user try to sync outlook?? the only thing this user has access to is Rdgateway and they dont have any Exchange or outlook.

Any idea?

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