With ktorrent 2.2.4 I'm getting some error messages from an incoming connection like this (many times):

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Authentication(S) to 86.61.38.208 : failure

Looking at firewall log, there are a lot error messages with this IP in it:

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Dec 25 15:55:37 linux kernel: SFW2-OUT-ERROR IN= OUT=eth0 SRC=192.168.1.2 DST=86.61.38.208 LEN=52 TOS=0x00 PREC=0x00 TTL=64 ID=54654 DF PROTO=TCP SPT=22839 DPT=14982 WINDOW=91 RES=0x00 ACK FIN URGP=0 OPT (0101080A025ED94F004BA763)
Dec 25 16:00:18 linux kernel: SFW2-OUT-ERROR IN= OUT=eth0 SRC=192.168.1.2 DST=86.61.38.208 LEN=52 TOS=0x00 PREC=0x00 TTL=64 ID=60584 DF PROTO=TCP SPT=20617 DPT=14982 WINDOW=46 RES=0x00 ACK FIN URGP=0 OPT (0101080A02628E9F004C46EA)
Dec 25 16:01:37 linux kernel: SFW2-OUT-ERROR IN= OUT=eth0 SRC=192.168.1.2 DST=86.61.38.208 LEN=52 TOS=0x00 PREC=0x00 TTL=64 ID=60585 DF PROTO=TCP SPT=20617 DPT=14982 WINDOW=46 RES=0x00 ACK FIN URGP=0 OPT (0101080A02639843004C46EA)
Dec 25 16:42:36 linux kernel: SFW2-OUT-ERROR IN= OUT=eth0 SRC=192.168.1.2 DST=86.61.38.208 LEN=54 TOS=0x00 PREC=0x00 TTL=64 ID=13349 DF PROTO=TCP SPT=50000 DPT=1706 WINDOW=7504 RES=0x00 ACK PSH FIN URGP=0
Dec 25 16:44:12 linux kernel: SFW2-OUT-ERROR IN= OUT=eth0 SRC=192.168.1.2 DST=86.61.38.208 LEN=54 TOS=0x00 PREC=0x00 TTL=64 ID=13350 DF PROTO=TCP SPT=50000 DPT=1706 WINDOW=7504 RES=0x00 ACK PSH FIN URGP=0

Using susefirewall I've opened right ports (50000 TCP+UDP, 4444 UDP) and forwarded the from my router.
Why is firewall blocking this particular peer?

If you see those messages in the KT logs, the firewall hasn't blocked anything.