Unable to connect backend applications through EP in DMZ1 firewall?

Dear all,
To brief our landscape, its look like below.
Internet -> DMZ1(Webservers)->Portal(DMZ2)->Internal(Backend Systems).
We tried to access the backend systems through portal in DMZ2..its working fine. When we tried to access the portal in DMZ1...its coming perfectly, when we access the backend applications through portal in DMZ1...its not coming...it says...operation timed out...
Kindly suggest me what would be the problem...all the ports are open in DMZ1 and DMZ2... But we hav not done reverse proxy in DMZ1(Webservers), Can we try after doing Apache reverse proxy in DMZ1. Pl suggest me
Rgds
PRadeep

Hi Netanel,
Thanks for ur reply...
See, we hv writen a rewrite rule for all three systems like R/3, BW and SCM
RewriteRule ^/sap(.)/public(.) http://myr3sever.company.domain.com:r3port/R3$1 [P]
RewriteRule ^/sap(.)/bc/bsp/sap(.) http://myscmsever.company.domain.com:scmport/SCM$1 [P]
etc..
We are differentiating the systems with their names...but when it rewrites..its taking R3 string as well in the path...
Like
http://webserver.company.domain.com/R3/sap/bc/gui/sap/its/webgui.
I think if we remove R3 string at the time of rewrite, then we should be able to get i belive.
kindly suggest me
Rgds
PRadeep

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relno      7110
patchlevel 0
patchno    81
intno      20020600
make       multithreaded, Unicode, 64 bit, optimized
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[Thr 47613442779232] set HTTP state to LISTEN
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[Thr 47613442779232] *** I listen to internal port 3900 (3900) ***
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