Monitor failing with firewall port redirection?

We have an LTM 9.4.7 and we are using a monitor for a keepalive.htm page using HTTP 1.1 settings. It works fine, when no port redirection is used on the firewall. I did a couple traces on the F5 and I see the monitor responding back fine thru the firewall to the F5 (10.0.52.11)with a 200 OK but the serivce stays down. Any ideas as to why?

 

Send String

 

GET /keepalive.htm HTTP/1.1\r\nHost: \r\nConnection: close\r\n\r\n

 

Rec String

 

HTTP/1.1 200 OK

 

Alias Port: 8080

 

[root@F5:Active] config tcpdump -ni VIP -X -s 0 host 10.0.52.11

 

09:38:47.255082 10.0.52.11.37503 > 10.0.53.252.webcache: P 1:63(62) ack 1 win 5840 (DF)

 

0x0000 4500 0072 7993 4000 4006 42ec 0a00 340b E..ry.@.@.B...4.

 

0x0010 0a00 35fc 927f 1f90 5677 035f d5b5 6949 ..5.....Vw._..iI

 

0x0020 8018 16d0 acc3 0000 0101 080a 5cb9 3ed4 ............\.>.

 

0x0030 5cb9 3ed5 4745 5420 2f6b 6565 7061 6c69 \.>.GET./keepali

 

0x0040 7665 2e68 746d 2048 5454 502f 312e 310d ve.htm.HTTP/1.1.

 

0x0050 0a48 6f73 743a 200d 0a43 6f6e 6e65 6374 .Host:...Connect

 

0x0060 696f 6e3a 2063 6c6f 7365 0d0a 0d0a 0d0a ion:.close......

 

0x0070 0d0a ..

 

09:38:47.257766 10.0.53.252.webcache > 10.0.52.11.37503: P 1:290(289) ack 63 win 4442 (DF)

 

0x0000 4500 0155 6b35 4000 fe06 9266 0a00 35fc E..Uk5@....f..5.

 

0x0010 0a00 340b 1f90 927f d5b5 6949 5677 039d ..4.......iIVw..

 

0x0020 8018 115a 4d46 0000 0101 080a 5cb9 3ed8 ...ZMF......\.>.

 

0x0030 5cb9 3ed4 4854 5450 2f31 2e31 2032 3030 \.>.HTTP/1.1.200

 

0x0040 204f 4b0d 0a53 6572 7665 723a 204d 6963 .OK..Server:.Mic

 

0x0050 726f 736f 6674 2d49 4953 2f35 2e31 0d0a rosoft-IIS/5.1..

 

0x0060 436f 6e6e 6563 7469 6f6e 3a20 636c 6f73 Connection:.clos

 

0x0070 650d 0a44 6174 653a 2054 6875 2c20 3237 e..Date:.Thu,.27

 

0x0080 2041 7567 2032 3030 3920 3136 3a33 383a .Aug.2009.16:38:

 

0x0090 3437 2047 4d54 0d0a 436f 6e74 656e 742d 47.GMT..Content-

 

0x00a0 5479 7065 3a20 7465 7874 2f68 746d 6c0d Type:.text/html.

 

0x00b0 0a41 6363 6570 742d 5261 6e67 6573 3a20 .Accept-Ranges:.

 

0x00c0 6279 7465 730d 0a4c 6173 742d 4d6f 6469 bytes..Last-Modi

 

0x00d0 6669 6564 3a20 5468 752c 2031 3620 4a75 fied:.Thu,.16.Ju

 

0x00e0 6c20 3230 3039 2032 303a 3536 3a32 3620 l.2009.20:56:26.

 

0x00f0 474d 540d 0a45 5461 673a 2022 3066 3932 GMT..ETag:."0f92

 

0x0100 6365 3235 3736 6361 313a 6132 6222 0d0a ce2576ca1:a2b"..

 

0x0110 436f 6e74 656e 742d 4c65 6e67 7468 3a20 Content-Length:.

 

0x0120 3437 0d0a 0d0a 5465 7374 2066 726f 6d20 47....